The Cottagers enjoyed a surprisingly good start to the season after losing a number of key players, including Mousa Dembele, Clint Dempsey and Danny Murphy.
That initial flourish has suddenly worn off, though, and Fulham have not won a match since mid-October, thanks in no small part to the impact injuries and suspensions have had on the squad.
Jol brought in free agents Giorgos Karagounis and Mickael Tavares after the summer window closed in a bid to beef up his side and there look set to be more new faces arriving in west London.
"If you would have told me in May that in December Bryan Ruiz won't be there through injury, Mousa Dembele and Clint Dempsey had gone, I would have thought it would be almost impossible," Jol said .
"Luckily enough we brought in some quality players but they play up front most of the time, like Dimitar Berbatov, Mladen Petric, Ashkan Dejagah and Hugo Rodallega.
"Of course we will always look to strengthen, but the January transfer period is not an ideal one.
"The good players will stay at their clubs or you can't afford them because clubs are asking too much money, but we will come up with something.
"We always look to strengthen the squad because we lost players."
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