Jol's side have struggled for consistency in the Barclays Premier League this season and travel to face Liverpool on Saturday having won just one of their past nine league matches.
The transfer window opens at the turn of the year and it was Fulham who pulled off one of the deals of the summer when they signed striker Dimitar Berbatov from Manchester United.
Jol reckons it is difficult to sign high-quality players unless they are unsettled at their current club but revealed he does have a couple of names in mind.
"We showed that we are able to get players in, even when they are not on the market because if players are on the market it is different," he said.
"If you were president, chairman or chief executive at another club you never try and get rid of your best players - so we have to try and be inventive.
"We have to try to get the players who are not playing well or not fitting in at their other clubs, but they have to be better than the players we have got so we will come up with one or two solutions.
"We are looking for good players and they are always under contracts with other clubs, you have to pay but if they are playing well, we wouldn't sell (Dimitar) Berbatov now, it means other clubs won't do that.
"It is not an easy situation but we know maybe one or two players who are having problems at their clubs - we always look to strengthen and if it possible we will do it."