Benjamin Mendi will be relegated to Manchester City after knee surgery on Wednesday.
The defender had surgery on his left knee in Barcelona after leaving the team in France, City said.
It's a meniscus problem, not a repeat of the knee injury injuries that saw him lose most of the last season. No time frame has been provided for the recovery of the full refund.
"Surgery was done on Wednesday night and everyone in Manchester City wants Benjamin's rapid recovery," he added.
Mendy played 90 minutes at Manchester City's derby 3-1 victory on Sunday, but withdrew from the international duty after. The 24-year-old was assessed by surgeon Dr. Ramon Cugat in Barcelona before surgery.
Mendy, which has nine caps for France, suffered a knee injury injury in September 2017 before returning in April.
He made seven appearances last season, winning the title of the city, enough to win the winner's medal after his participation in Monaco for £ 52m.
Fabian Delph, Danilo and Oleksandr Zinchenko are options to replace him on the left-hand side of City manager Pep Guardiola.