Martin Jol has reiterated that Clint Dempsey and Moussa Dembele are not for sale after confirming there have been no bids for the Fulham duo.
Dempsey has scored 23 goals in all competitions for Fulham this season, but the USA attacker is out of contract at the end of next term.
He has been linked with a summer move to Everton, while Belgium international Dembele is reportedly attracting interest from Manchester City and local rivals United.
However, Jol is determined to hang on to the influential attacking pair and is focused on improving his squad for next season.
"There are no clubs who have come in for bids. Even if they put a bid in they are not for sale," said the Fulham manager.
"Of course you worry because I want to keep my best players. If we can do that and add two or three, we could have a very good squad.
"I feel they still will be here (next season)."
Jol added that talks with out-of-contract players Danny Murphy, Andy Johnson and Stephen Kelly will begin next week.