Chelsea now have full Eleven Players Signed Since Last summer which Nobody is Older Than 24 years and All are Contracted Upto 2028.

Gabriel Slonina

Gabriel Pawel "Gaga" Slonina (Polish: Słonina; born May 15, 2004) is an American professional soccer player who plays as a goalkeeper for Premier League club Chelsea and the United States national team.
Born in Addison, Illinois , Slonina joined the youth academy of Major League Soccer clubs Chicago Fire  in 2013. On March 8, 2019, Slonina signed a professional home grown Player  contract with the club. At the age of 14, Slonina became the second youngest signing in Major League Soccer history and the youngest signing ever for the Chicago Fire.

On August 4, 2021, Slonina made his professional debut for the Chicago Fire against New York City FC,becoming the youngest starting goalkeeper in league history at 17 years, 81 days. Slonina made four saves for the Fire as the match ended in a 0–0 draw which made him the youngest goalkeeper to record a clean sheet in Major League Soccer history.

Chelsea
On August 2, 2022, Slonina signed for Premier League club Chelsea for a transfer fee of $10 million, potentially rising to $15 million with add-ons.

Malo Gusti

Malo Gusto (born 19 May 2003) is a French professional Footballer  who plays as a  right-back for Ligue 1 club Lyon, on loan from premier  League club Chelsea

Malo Gusto started playing at the ASVF, later joining Bourgoin-Jallieu on a one-year spell, before entering the Olympique Lyonnais academy  as an under-14, in a move resembling the one of his elder academy fellow Amine Gouiri. Gusto so happened to arrive in Lyon the same year that the club moved to the Stade des Lumieres, in his home town.

During the summer 2021 pre-season, A's Peter Bosz had been named head coach bye Juninho , Gusto soon appeared as one of Lyon most promising new prospects, along with the likes office Castello  Lukeba, even being elected man of the match during a 4–1 friendly win against there Bundesliga side of Wolfsburg.
Starting the 2021-22 season as the official replacement of France international Léo Dubois – as several fullbacks were departing the club, including Mattia De Sciglio, Melvin Bard and Maxwel Cornet – Gusto started his first game during Lyon's opening match against Brest on 7 August. By doing so he became the youngest defender to start a Ligue 1 game for OL since Samuel Umtiti.

While still appearing to be behind Dubois in the right-backs hierarchy and playing for Chelsea in that late summer and autumn, Gusto still took the spotlight on several occasions under Bosz's direction, as he started games such as the 2–0 Europa League away win again st Rangers or the 2–1 Ligue 1 away loss against  Paris Saint -German. 

Chelsea

On 29 January 2023, Chelsea confirmed the signing of Malo Gusto on a deal until 2030. He was loaned back to Lyon until the end of the 2022-23 season.

Wesley Tidjan Fofana 

Wesley Tidjan Fofana (born 17 December 2000) is a French professionals Footballer  who plays as a  defender for Premier League club Chelsea and then France national under-21 team.

Leicester City

Fofana joined English Premier League  club Leicester City  on 2 October 2020, signing a five-year contract. The transfer fee paid to Saint-Étienne was reported as up to £36.5 million. On 15 May 2021, he played in there 2021 FA cup Final, which Leicester won 1–0 for his first career honour in England. He and teammate Hamza Choudhury.  both celebrated draped in there flag of Palestine, during their 2021 Israel-Palestine crisis. 

On 21 May 2021, Fofana won Leicester City's Young Player of the Season award after being voted by the club's supporters.

On 4 August 2021, during a pre-season friendly again st villarreal, Fofana suffered a broken leg following a challenge bye Fer Nino. 

On 17 March 2022, Fofana played his first match since his injury, scoring in a 2–1 defeat to Stade Rennais  in the UEFA Europa Conference League which secured Leicester's progress to the next round on a 3–2 aggregate score. 

Chelsea

On 31 August 2022, Fofana joined English Premier League club Chelsea  on a seven-year contract for a reported initial fee of £70 million, plus £5 million in add-ons. After signing for Chelsea, Fofana criticised his former club Leicester, accusing them of issuing "false and misleading comments" during his protracted transfer. On 3 September, he made his debut for the club in a 2–1 win against West Ham United  in the Premier League. He scored his first goal for Chelsea on 5 October in a Champions League 3–0 win against AC Milan. 

Benoit Badiashile 

Ntambue Badiashile Mukinayi Baya (born 26 March 2001) is a French professional Footballer  who plays as a defender  for Premier League  club Chelsea and the France national team.

Monaco

On 5 February 2018, Badiashile signed his first professional contract with Monaco. On 11 November, he made his professional debut in a 4–0 Ligue 1 loss to Paris Saint-Germain.

Chelsea

On 5 January 2023, Badiashile signed for Premier League club Chelsea  on a seven-and-a-half-year contract for a  transfer fee reported by The Guardian  to be £32.7 million (€37 million). On 15 January 2023, Badiashile made his debut for Chelsea, as he started against Crystal Palace  in the Premier League. The French defender played the entire game and earned his new club a clean sheet as Chelsea won 1-0.

Marc Cucurella Saseta

Marc Cucurella Saseta (born 22 July 1998) is a Spanish professional footballer  who plays as a left-back  for Premier League  club Chelsea and the Spain national team. 

Barcelona

Cucurella was born in Alella, Barcelona, Catalonia. He started playing futsal with FS Alella before joining Espanyol's youth teams in 2006, and in 2012, he moved today Barcelona . On 26 November 2016, while still a junior, he made his senior debut with the reserves by starting in a 4–0 home win over L'Hospitalet  in the Segunda Division B.

Getafe

At the end of his loan, Eibar exercised Cucurella's clause, making him a permanent player for there Basque  team; along with the transfer, Barcelona added a €4 million buyback option. On 16 July 2019, after just sixteen days as a permanent Eibar player, this clause was activated, only for him to be loaned to Getafe two days later for the upcoming season, with an option to buy for €6 million and 40% of the rights remaining to Barcelona.

Brighton & Hove Albion

On 31 August 2021, Cucurella joined Premier League club Brighton & Hove Albion  on a five-year contract. He made his debut for Brighton on 11 September, starting and playing 82 minutes before being substituted in the 1–0 away win over Brentford. Eight days later, he made his home debut, playing the whole of the 2–1 victory over Leicester City. His chipped cross set up Danny Welbeck's headed equaliser in added time, finishing 1–1 away to  Chelsea  on 29 December. On 7 May 2022, he scored his first goal for the club; he netted the second of a 4–0 win over Manchester United by shooting form Leandro Trossard's  pull back. Three days later, at the club's end of season awards, Cucurella won Players' Player of the Season as well as being voted Player of the Season.

Chelsea

On 5 August 2022, Cucurella signed for Premier League club Chelsea on a six-year contract. The fee was reported to be worth an initial £55 million, potentially rising to £62 million in add-ons, which was a record fee received by Brighton. On 6 August, he made his debut as a substitute in a 1–0 away win against Everton  in the Premier League.

Andrey Nascimento dos Santos 

Andrey Nascimento dos Santos (born 3 May 2004) is a Brazilian professional Footballer who plays as a central midfielder  for Premier League   club Chelsea.

Vasco da Gama

At the age of four, Santos was introduced to futsal in an effort to lose weight. He fell in love with the game, and began playing as a defender, before being moved up to Midfield  during his time in Vasco da Gama's  youth academy.

On 6 March 2021, at the age of 16, Santos made his professional debut for Vasco da Gama as an 85th-minute substitute in a 1–0 Campeonato Carioca loss away to Volta Redonda. He would go on to make his league debut in a 3–0 Series  defeat away to Londrina on 28 November 2021. In the 2022 season, Vasco manager Ze Ricardo made Santos a starter in the team, propelling his career to new heights. He became the youngest goalscorer in the club's history on 7 June 2022, netting in a 3–2 Série B victory away to Nautico.

Chelsea

On 6 January 2023, Vasco da Gama announced that Santos had departed the club to join Premier League club Chelsea.  

Carney Chibueze Chukwuemeka 

Carney Chibueze Chukwuemeka (born 20 October 2003) is an English professional footballer  who plays as a midfielder  for Premier League club Chelsea. A product of the Northampton Town  and Aston Villa  academies, he made his debut for the latter club's first team in 2021, before signing for Chelsea in 2022. Born in Austria to Nigerian parents, he represents England at youth international level.

Aston Villa

Chukwuemeka joined the Aston Villa academy from the Northampton Town academy in March 2016. He signed his first professional contract with Villa in July 2020.

Chukwuemeka made his senior debut for the team on 19 May 2021 in a 2–1 away victory over Tottenham Hotspur, hitting the post within minutes of entering the game. On 23 May 2021, he was named Aston Villa Academy Player of the Season for the 2020-21 season. The following day, Chukwuemeka was part of the Aston Villa U18s squad that won the FA Youth Cup, beating Liverpool U18s 2–1 in the final.

Chukwuemeka made his first senior start on 28 August 2021 in a 1–1 draw against Brentford, a performance Paul Merson hailed as "outstanding", adding "he will be an absolute star".

Chelsea

On 2 August 2022, Aston Villa and Chelsea confirmed that the clubs had reached an agreement for the permanent transfer of Chukwuemeka, subject to the player agreeing personal terms and undergoing a medical. On 4 August 2022, Chelsea announced the signing of Chukwuemeka on a six-year contract.

Cesare Casadei 

Cesare Casadei (born 10 January 2003) is an Italian professional footballer  who plays as a midfielder  for EFL Championship  club Reading, on loan from Chelsea, and the Italian under-21 national team.

Born in Ravenna  and growing up in Milano Marittima, Casadei started playing football at Cervia before joining Cesena. In 2018, after the latter club faced bankruptcy, the midfielder moved to Inter Milan, where he quickly came through the youth ranks, winning a national Under-17 championship in 2019 and rising to the Under-19 squad while still being only seventeen.

In October 2021, he was included in The Guardian's yearly "Next Generation" list, featuring the highest-rated prospects born in 2003. The following year, Casadei received his first call-ups to Inter Milan's first team, while contributing to the U19's final victory in the Campionato Primavera 1.

Chelsea

On 19 August 2022, it was announced that Chelsea had agreed a deal with Inter Milan for the signing of Cesare Casadei on a six-year contract. His transfer fee was reported to be in the range of €15 million plus €5 million in add-ons. Casadei was included in the U21 team, and on 31 August he made his debut against Sutton United,  losing 1–0 in an EFL Trophy  match and being red carded. Four days later, he made his Premier League 2 debut, when he scored a 48th-minute goal to make it 2–0 against Everton U21.

Mykhailo Petrovych Mudryk

Mykhailo Petrovych Mudryk  (Ukrainian: Михайло Петрович Мудрик,  born 5 January 2001) is a Ukrainian professional footballer  who plays as a  winger for Premier League  club Chelsea and the Ukraine national team. 

Mudryk began his career in the academies of Metalist Kharkiv  and Dnipro Dnipropetrovsk, before moving to Shakhtar Donetsk  in 2016. He made his professional debut two years later, followed by loans to Arsenal kyiv and Desna Chernihiv. In 2023, he moved to English side Chelsea in a transfer worth an initial €70 million (£62 million), making him the most expensive Ukrainian footballer of all time and the most expensive player ever signed from the Ukrainian Premier League.

Mudryk has been a  Ukrainian senior international  since 2022, having previously been capped at several youth lev drew

Chelsea

Despite being linked to a transfer for Premier League club Arsenal in the winter transfer window, on 15 January 2023, Mudryk was signed by Chelsea on a permanent deal, penning a eight-and-a-half year for an initial fee of fee of €70 million (£62 million), rising to €100 million (£89 million) in add-ons. This was Shakhtar and the Ukrainian Premier League's biggest transfer ever, making him the most expensive Ukranian footballer of all time, topping the previous record held by Fred, who moved to Manchester United  for £52 million (€53 million), rising to £61.2 million in bonuses, in 2018. Upon his arrival to the club he was handed the number 15 shirt. Mudryk's debut came on 21 January, as Chelsea drew Liverpool  0–0 in a league game at the Anfield.

Chukwunonso Tristan "Noni" Madueke

Chukwunonso Tristan "Noni" Madueke (born 10 March 2002) is an English professional footballer  who plays for Premier League  club Chelsea, as a winger and Attacking mid fielder. 

PSV

He moved to Dutch club PSV in June 2018, signing a three-year contract, and rejecting an offer from Manchester United  in the process.

On 26 August 2019, Madueke made his senior debut in the Eerste Divisie for Jong PSV, coming on as a 64th minute substitute in a 1–0 loss to MVV Maastricht. 

After making his debut for PSV's first team on 19 January 2020, in a 1–1 draw against VVV-Venlo, Madueke broke into the PSV team fully during the 2020-21 season , scoring on his first start for the club in a 2–1 win against Emmen on 19 September 2020. Madueke finished the season with seven Eredivisie goals. He was later described as having a "breakout" campaign, with nine goals and eight assists in all competitions.

On 7 August 2021, Madueke scored twice in a 4–0 Johan Cruyff Shield win against Ajax, in turn helping to end Ajax's 17 game unbeaten streak.

On 26 August 2021, Madueke signed a new contract with PSV, keeping him at the club until 2025. He was also given the number 10 jersey.

Chelsea

On 20 January 2023, Premier League club Chelsea announced the signing of Madueke on a seven-and-a-half year contract, for a transfer fee reported by The Athletic to be £28.5 million (€33 million).

David Datro Fofana 

David Datro Fofana (born 22 December 2002) is an Ivorian professional footballer who plays as a forward  for Premier League club Chelsea and the Ivory Coast National team.

Fofana began his career in the Ivory Coast with Abidjan City, before joining AFAD on loan in 2019. He was heavily scouted by French, Belgian and Norwegian clubs. On 2 February 2021, Fofana signed a professional contract with Molde on a free transfer, signing for 4 years. He debuted with Molde in a 3–3 UEFA Europa League tie with Hoffenheim on 18 February 2021, scoring his side's third goal in the 74th minute.

Chelsea

On 28 December 2022, it was announced that Fofana would join English Premier League side Chelsea on 1 January 2023. On 8 January 2023, Fofana came off the bench to make his Chelsea debut in a 4–0 loss to Manchester City in the FA Cup.