Mouirnho had said earlier in the day that he would be the new Chelsea manager by the end of the week.
Jose Mourinho has been confirmed as the new manager of Chelsea on a four-year contract.
Ron Gourlay, Chelsea's chief executive, said: "I am delighted to welcome Jose back to Chelsea. His continued success, drive and ambition made him the outstanding candidate.

"It is our aim to keep the club moving forward to achieve greater success in the future and Jose is our number one choice as we believe he is the right manager to do just that.

"He was and remains a hugely popular figure at the club and everyone here looks forward to working with him again."

Mourinho's era in charge at Real Madrid ended on Saturday night with a 4-2 La Liga win over Osasuna, with the Portuguese having already confirmed he would leave the Spanish giants at the end of the season