Diego Costa (centre) was taken off injured against PSG

Guus Hiddink has confirmed both Diego Costa and Eden Hazard are injury doubts for Saturday's FA Cup quarter-final at Everton, after the pair came off in the second half of Chelsea's 2-1 defeat to Paris Saint-Germain.

Costa was substituted with 30 minutes remaining in the game and went straight down the tunnel to receive treatment, while Hazard came off after 77 minutes.

Hiddink confirmed both players will be assessed by the club's medical staff at Chelsea's training ground on Thursday to see if they stand a chance of playing at Goodison Park.

Oscar of Chelsea comes on as a second half substitute for Eden Hazard (right)

"We'll see if there is big damage tomorrow," Hiddink told reporters after the game. "Diego was desperate to play today although he was not 100 per cent fit.

"I don't know it's worse, we'll see tomorrow. In two days we have to play another game."

Costa, who had been labeled a 'fraud' in a post on one of PSG's official social media accounts in the build-up to the game, scored against his antagonists but it was not enough to keep Chelsea in the competition.

Costa (left) scored an equaliser on the night for Chelsea before his injury

The FA Cup is now the only competition they can win in what has been a nightmare season.

On the prospect of not playing another Champions League game for at least 18 months, Hiddink reflected: "Chelsea is now in a transition period, that's true, it's difficult to get into fourth position now.

"Chelsea must consider it's short-term future now and how to handle this, but they knew that beforehand."