The Colombia international has scored just three goals in 33 appearances since his move from Wigan last summer.
And Jol is keen for 28-year-old Rodallega to start making an impact for the west Londoners in their remaining pre-season friendlies.
"Hugo is a goalscorer and should get at least 10 goals," said the Dutchman, quoted in The Sun.
"That is something we have to work on.
"But he will say, 'Boss, I didn't start all the matches', so you have to look at it from both sides."
With Bryan Ruiz and Marcello Trotta as the club's only other strikers, Jol is hopeful of adding a few new faces before the start of the new Premier League season.
"I was very happy with Dimitar last season. But we need to help him and are still looking for one or two players," he added.