We are delighted to announce the signing of Tosin Adarabioyo.
The 28-year-old centre-back joins us from Chelsea and brings with him a wealth of Premier League experience.
Tosin said: "I'm in an important part of my career and speaking to the Head Coach and knowing the type of football he wants to play, I think it's a very good fit. He wants the team to play with courage and that's something that I always look to do.
"I want to achieve the absolute best, to push this team and this club as much as possible to where we deserve to be.
"That's something that has to be done every single day, especially on the training pitch, and I will be bringing that mentality to the Club."
Sporting Director, Johan Lange, said: "Tosin is an excellent addition to our squad, bringing a wealth of experience, leadership and quality to our central defensive options.
"Throughout our conversations with Tosin, it was clear how motivated he is, and how he understands the standards and expectations here.
"We are delighted to have secured his signature and look forward to seeing him make a significant contribution both on and off the pitch."
Head Coach Roberto De Zerbi, said: "Tosin is a strong, athletic defender who plays with confidence and understands the demands of playing at the highest level.
"I've also been impressed with his mentality and desire to be part of what we are building. He knows the responsibility that comes with representing this Club.
"We’re very happy to have Tosin with us and I know our supporters will quickly see the qualities he can bring to the team."
London-born, Tosin began his early career with Manchester City, signing for the club at the age of five. Working his way up through the ranks, he captained the club’s Under-18s regularly at just 16-years-old and made his senior debut for City in February, 2016, in an FA Cup tie against Chelsea.
Becoming Manchester City's youngest-ever player to start a European game at 19 years of age, he made eight senior appearances for the Citizens.
A loan spell to West Bromwich Albion followed in 2018/19 and he enjoyed his period at the Hawthorns, making 36 appearances for the Baggies as they reached the Championship play-offs. He moved on loan again the next campaign, this time to Blackburn Rovers where he made a further 35 senior appearances, scoring three goals.
An imposing figure at the back, Tosin left Manchester City on a permanent basis in October, 2020, and headed to Fulham, making 33 Premier League appearances in his debut season at Craven Cottage.
A vital part of the team that secured promotion back to the Premier League at the first attempt in 2021/22, he made a total of 132 appearances for Fulham, scoring five goals across a four-year spell.
In July, 2024, Tosin made the short trip across west London to join Chelsea. He scored his first goal for the Blues in a UEFA Conference League fixture in November, 2024 - a competition he went onto win at the end of that campaign while he was also named in the Team of the Tournament.
In his debut season at Stamford Bridge, he made 41 appearances in all competitions, scoring five goals and was part of the Blues' squad that won the 2025 FIFA Club World Cup, making four appearances across the tournament.
Captaining Chelsea for the first time in October, 2025, in a Carabao Cup fixture, he made a total of 70 appearances for the west London side, scoring on seven occasions.
On the international stage, Tosin has represented England across numerous age groups up to Under-19 level.
Welcome, Tosin!