Chelsea have announced manager Jose Mourinho underwent surgery on his elbow on Monday in an attempt to cure a long-standing complaint.
The 50-year-old oversaw Chelsea's 3-1 Premier League defeat of Manchester United at Stamford Bridge on Sunday before attending a Football Writers' Association dinner at the Savoy Hotel where he was honoured with an award.
He then went under the surgeon's knife on Monday.
Chelsea stated on Twitter: "Jose Mourinho today underwent a minor arthroscopic procedure on a long-standing elbow complaint. He will return to work tomorrow."
The operation was performed by doctor Didier Fontes in Paris. Mourinho may have to wear a sling as a precaution for a few days, but the operation came in a relatively lean period in Chelsea's fixture schedule.
Chelsea next play Stoke at Stamford Bridge in the FA Cup fourth round on Sunday, before a midweek contest at home to West Ham and another Premier League clash at Manchester City.
Mourinho was in fine fettle on Sunday evening after a result which took his side to within two points of leaders Arsenal and a point of City.
He is settled in England after returning to Chelsea following a near six-year absence last summer.
"Without love and happiness, I could not do my job," Mourinho said.
"The best thing football gave me was to make a decision about my future.
"Some managers go where they have to go, where the club comes, and sometimes it is not the best move, not what they want to do, but they go.
"I sat down with my wife and family, and said 'Where is the best place for us? Where can we be happier as a family? To be happy as a manager and enjoy more the family and life socially?'
"We decided England, after that, for the situation to be perfect it would be Chelsea and I was lucky because the door was open for me."