Ilkay Gundogan's season could be over after Manchester City announced the midfielder suffered cruciate ligament damage in midweek.
The Germany international fell awkwardly in the first half of City's victory over Watford at the Etihad Stadium on Wednesday and limped off in clear distress soon after following an unsuccessful attempt to play on.
City are not yet able to put a timescale on the length of lay-off facing the 26-year-old, who will undergo knee surgery, but it seems unlikely he could feature again in the 2016-17 campaign.
The club said in a statement: "Manchester City can confirm Ilkay Gundogan has sustained a cruciate knee ligament injury.