Jol's side are 14th in the Premier League table, just two points above the relegation zone.
His opposite number David Moyes has also come under fire since taking over from Sir Alex Ferguson at Old Trafford but the Dutchman insists such pressures are in the nature of the job.
"It is the same all over in the Premier League. If you don't get the results, people will be critical," said Jol.
"My boys will know they have to come out on the offensive, for them and for me as well, so they will give 100 per cent.
"Last week United were on 11 points and we were on 10 points, so that is not what you expect from a team like Man United.
"We saw all their games and against Real Sociedad, for example, they struggled to get a second goal.
"If you score only one goal, you are always under pressure and hopefully we can take the initiative.
"Of course we can't control the game for 90 minutes, but we will try to do something after the disastrous game against Southampton last week.
"We want to do better and I think we can do better."
Fulham have lost all five matches against United during Jol's time at Craven Cottage, and they have managed just four wins from their 13 home league matches in 2013.
"I think we can make Craven Cottage a fortress again" added Jol.
"It is a bit funny that we don't get the results at home. Over the last 10 years Fulham had few away wins and we already have two this season, so that is the only positive."