The 2-1 loss to Swansea extended the Cottagers' miserable run to one win in 12 and left them just four points above the bottom three.
Fulham are beginning to look in dire need of reinforcements but while Jol will try to dip into the transfer market when the window reopens on Tuesday, he was confident the return of injured players would be the real catalyst for a revival.
Bryan Ruiz certainly showed how much the Cottagers had missed him with a man-of-the-match performance in his first start for six weeks.
Jol was hoping the imminent recovery of Mahamadou Diarra, Mladen Petric and Damien Duff would have the same effect.
"If players come back from injury I think that will freshen up the squad as well," said the Dutchman, who admitted the trio were unlikely to return for Tuesday's New Year's Day trip to West Brom.
"If we can do something in the market, we will try to that. But it's not easy.
"You know as well as I do that clubs will wait and wait until you have to pay the maximum price and we will not do that."