Chelsea defender Gary Cahill has spent two nights in hospital with a mystery illness, according to reports.
It is understood that the 31-year-old was admitted to hospital on Tuesday after training and was only released on Thursday, following treatment and tests.
The Blues will take on Tottenham Hotspur in the semi-finals of the FA Cup on Saturday, but according to The Telegraph, Cahill is a major doubt for the game.
The newspaper goes on to speculate that Cahill first started to feel ill on Monday, the day after playing in Chelsea's Premier League 2-0 defeat to Manchester United.
Cahill has been Chelsea's on-field captain for much of the campaign, with John Terry out of favour.
