The Cottagers have failed to build on their 1-0 win at Sunderland on the opening day, losing to Arsenal and also away to Newcastle before conceding a stoppage-time equaliser to West Brom last weekend.
Jeers and cries of "Jol out" from some sections of the home support followed the final whistle against the Baggies, which the Dutchman described as "disappointing" in his post-match interviews.
Fulham Supporters' Trust has called for everyone to get behind the manager - who has been in charge since replacing Mark Hughes in 2011 and continues to have the support of new owner Shahid Khan - ahead of the west London derby with Chelsea at Stamford Bridge.
Jol, though, expressed some regret at his choice of words last weekend, when he also questioned what fans of a club of Fulham's stature should realistically expect.
"I think it is better not to talk about it, but I did, and I shouldn't have because they are entitled to express themselves," Jol told a press conference.
"They pay us to play football for them and they have got an opinion, and to lose [two points] in the 92nd minute was very disappointing - not only for them, but for me and the club.
"I talked about the fact that expectations can make you very unhappy at any club - Chelsea, even Manchester United, big clubs, smaller clubs, and especially at Fulham as well.
"We feel that we have got good players, but five of the seven new players were not even there last week so we still have to find a balance."
Jol remains confident the team's fortune can turn around as the squad integrate.
He said: "It is not easy, but I think there are probably 10 or 11 other teams that are not settled and play with different players, new players, so what I mean is that as soon as we gel together, we will be fine."
Chelsea suffered a surprise 2-1 home defeat in the Champions League against Basle on Wednesday evening, a second successive reverse for Jose Mourinho's men after they had been beaten at Everton.
Jol, though, knows better than to take the Blues lightly.
He said: "I think if we beat them it will be the first time that they have lost three games in a week, so it puts a little bit more pressure on them.
"However, I don't know if it is an advantage or not.
"When they lost against Everton, it put pressure on them in the Champions League, so they had to win that game.
"So to talk about must-win games, I think that for Chelsea this is a must-win game against us because they want to be champions in England."
Fulham are waiting on the fitness of striker Dimitar Berbatov, who has a hamstring problem which forced him off against West Brom.
Forward Darren Bent, though, should be available after his own hamstring concern.
Bryan Ruiz is out, but Jol revealed: "He had a traumatic ankle injury but not as bad as we thought. It's one ligament and it's getting better and better so he'll hopefully be back next week."
Goalkeeper Maarten Stekelenburg is still not yet match fit, while full-back Matthew Briggs is set for around three weeks out after a hernia operation.