Chelsea boss Frank Lampard cannot offer guarantees of Pedro and Willian being around for the second-leg of their Champions League round 16 tie with Bayern Munich.
Both players are off contract at the end of the Premier League season.
Chelsea trail 3-0 to Bayern Munich after the first leg.
Lampard said: "I had presumptions they will stay [until the end of the season].
"I don't want to say something I get wrong, because I'm looking at Liverpool and Wolves above anything else. We have seen the value not just of Willian on the pitch - Pedro hasn't played so much - but the value of their experience. I clearly would hope they would stay right until the end, I would think that's what the club and players want."
