Chelsea have appointed Strasbourg manager Liam Rosenior as their new head coach.
The 41-year-old Englishman joins the club on a six-and-a-half-year deal until 2032 and replaces Enzo Maresca, who left on New Year's Day.
"I am extremely humbled and honoured to be appointed head coach of Chelsea Football Club," Rosenior said.
"To be entrusted with this role means the world to me and I want to thank all involved for the opportunity and faith in undertaking this job. I will give everything to bring the success this club deserves."
Earlier on Tuesday, in his last press conference as Strasbourg manager, Rosenior confirmed he had "agreed verbally" to take over at Chelsea.
"I cannot turn down this opportunity to join an incredible club, incredible squad who are Club World Cup champions," Rosenior said.
Strasbourg are part of the Todd Boehly and Clearlake Capital-owned BlueCo multi-club ownership group that also controls Chelsea.
Rosenior said Strasbourg first-team coach Kalifa Cisse, assistant head coach Justin Walker and head of analysis Ben Warner will join him at Stamford Bridge.
Rosenior was appointed by Strasbourg in July 2024 and guided the French club to seventh in Ligue 1 last season, securing European football for the first time in eight years.
His final match was a 1-1 draw at Nice on Saturday, their fifth league game without a win.
They are seventh in Ligue 1 and top of the Conference League.
"The last 18 months have been a joy and the best of my professional career," Rosenior said.
"I'm here because I care about this club [Strasbourg] and I felt it was right to answer your questions physically here today before I move on.
"I will love this club for the rest of my life, but I cannot turn down Chelsea."
Former Fulham and Hull City defender Rosenior has never managed in the Premier League.
"I would not have accepted the Chelsea job if I was not ready," he said.
"There are clubs you just cannot turn down. I hope the Strasbourg fans can see that and be proud of that.
"I have had interest from many clubs, including Champions League clubs, which I have always been open with to [Strasbourg president] Marc [Keller] and our ownership."
Chelsea are fifth in the Premier League and face Fulham at Craven Cottage on Wednesday.
Caretaker manager Calum McFarlane took charge for Sunday's 1-1 draw at Manchester City.