“I’m here because I care about this club and I felt it was right to answer your questions physically here today before I move on.”
Rosenior said Strasbourg first-team coach Kalifa Cisse, assistant head coach Justin Walker and head of analysis Ben Warner will join him at Chelsea.
Ronseior joined 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,” Ronseior said.
“I will love this club for the rest of my life but I cannot turn down Chelsea.”
