Chelsea captain John Terry is out Sunday's FA Cup fifth-round tie with Manchester City with a hamstring injury.
Terry missed Chelsea's 2-1 Champions League last-16 first-leg loss at Paris St Germain on Tuesday night with the problem sustained in last Saturday's Premier League win over Newcastle.
The 35-year-old skipper's next appearance will be his 700th for Chelsea, who maintain a contract offer might be forthcoming after Terry revealed he would be leaving Stamford Bridge when his current deal expires at the end of the season.
"He will not be fit for this weekend," manager Guus Hiddink said.
"I saw him this morning. He was with the physios yesterday, trying a bit on the pitch.
"(But) still too many problems to be fit for the weekend."
Hiddink hopes Terry will be fit to play in the February 27 Premier League game at Southampton.
But Hiddink urged caution with Terry, who will be keen to return as soon as possible.
The Dutchman added: "We have a week, I hope next weekend he will be available.
"I cannot predict it. I think we have to be a bit cautious with him as well."