City said in a statement that De Bruyne is undergoing tests to assess the extent of the injury, but the Belgian star himself expects to be out for between nine and 12 weeks.
Had it not been for Mohamed Salah's Golden Boot-winning 32 strikes then De Bruyne would nearly certainly have won PFA Player of the Year, highlighting just how important he was last campaign.
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According to www.metro.co.uk, De Bruyne faces around two months out after suffering the injury when he caught his studs in the turf before leaving the training ground on crutches.
He played his first competitive football of the season against Arsenal on the opening day of the Premier League on Sunday, coming on after 60 minutes to replace Riyad Mahrez.
Although perhaps none are as influential as De Bruyne, the likes of Bernardo Silva, Leroy Sane and Ilkay Gundogan would very likely be starters in any other Premier League side.
This would be a huge blow to City's hopes of retaining their title, with De Bruyne having been so instrumental for the Citizens.