Chelsea boss Frank Lampard is unsure whether Willian and Pedro would stay beyond the FA Cup final to play in Chelsea's last-16 Champions League tie on 8 August.
They 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."
