Manchester City winger Scott Sinclair had surgery on his shoulder and is now recovering in hospital.
Sinclair was taken ill during training and missed his side's draw against his former club Swansea on Saturday.
The winger - who joined the Citizens for £6.2million - has hardly had a chance this year, but will remain in hospital as he recovers from his surgery.
City boss Roberto Mancini sent Sinclair his best wishes, and hoped to have him back soon.
"We are very sorry for Scott but we hope he recovers quickly," said the Italian. "Scott is getting better, he is in the hospital."
Sinclair has only appeared 11 times this Premier League campaign for City and only had two starts. The move has obviously been a backward step for the lively winger who had such a promising season with Swansea in 2011/12.
Sinclair has made some money from the deal but has been starved of first-team football, having scored 36 goals in 91 appearances for the side from South Wales over two seasons before his big move to the Etihad Stadium.
Michael Laudrup has already mentioned to the media he could leave the door open if Sinclair would like a return to the Liberty Stadium.
The Swans gaffer said: "I don't know what I can say for that position. We have players there now and other players who can play that position that we are looking at.
"And we have to make some decisions when we start talking to people about what is possible and what is not because it is one thing having names on paper and another when you start talking about salaries, transfers and all that."