Pep Guardiola is expected to miss Manchester City's next two Premier League matches after undergoing a routine operation on a back problem.
The surgery was performed in Barcelona, where the Man City manager will now recuperate until after the September international break.
Assistant coach Juanma Lillo, who recently returned for a second spell alongside Guardiola, will take charge of the defending champions at Sheffield United on Sunday and at home against Fulham the following weekend.
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A Man City statement said: “The Manchester City boss has been suffering with severe back pain for some time lately, and flew out to Barcelona for emergency surgery performed by Dr Mireia Illueca.
"The surgery was a success, and Pep will now recover and rehabilitate in Barcelona.
“In his absence, assistant manager Juanma Lillo will oversee coaching of the first team on the training field and will assume duties on the touchline until Pep’s return. He is expected to return after the forthcoming international break.”
Everyone at the Premier League wishes Guardiola well.