Jol believes that Newcastle's commitments in the Europa League could cost them dear.
"I've been in the same situation a couple of times and I can tell you it's not easy," said Jol. "You have to focus on the Europa League and then the league and that combination can cost you.
"A couple of years ago I played in the semi-finals of the Europa League in Germany and I was really happy to drop out of that.
"In the end we achieved what we wanted."