After losing the likes of Clint Dempsey, Mousa Dembele and Danny Murphy last year, there again looks set to be another high turnover of midfielders at Craven Cottage.
Giorgos Karagounis, Mahamadou Diarra, Chris Baird and Simon Davies have all yet to extend their contracts past the end of the season.
The on-loan quartet of Urby Emanuelson, Emmanuel Frimpong, Stanislav Manolev and Eyong Enoh also see their stays expire in the summer, although Fulham have an option to make the latter duo's moves permanent.
Jol has some tough decisions to make over the coming months in regards to those players and knows new midfielders need to arrive ahead of the new campaign.
"If you look at the defence, I think we are fine," the Dutchman said.
"If you look at the midfield, I think Steve Sidwell is probably the only one left if you think of all the players we had six or seven months ago. We have to do something.
"Up front, Mladen Petric we will talk to him as he is on a one-year deal [which expires].
"Sascha Riether we have an option in his loan [to make it permanent] and we will probably take that.
"For the rest, I don't see any problem but in midfield we can do something because there is only one or two left. Karagounis is also on a one-year deal so Sidwell is probably the only one who is on a long-term contract."