Danny Murphy and Dickson Etuhu both went to Blackburn Rovers and four strikers have also departed the club, which has led to Jol's comments that the squad could do with more additions.
"If everything stays as it is I am pretty satisfied, and we are still working to get two or three players in," Jol told Sky Sports News.
"It depends on what happens. You've heard all the rumours about the big players, our good players, so hopefully they will stay. We want them to stay, that is important.
"We need at least a midfield player. We have got two [strikers in], Hugo Rodallega and Mladen Petric, so we need one or two strikers as well."
Fulham beat MK Dons 1-0 this evening in a friendly.