The loss means that Fulham will have to wait until the final game of the group stage to learn if they will have secured a place in the Round of 32.
"That's always disappointing because in the second-half we did well defensively from their crosses," Jol told fulhamfc.com after the match. "Normally we're very good at defending crosses so that was harsh.
"We put on Kasami for Dembele, who had asked for a substitution, then you hope to keep the ball in their half - but we couldn't do that and they broke and scored.
"Duff has got a problem with his calf, he was out for two weeks then he came back but it's the same problem. Dembele hopefully is fine. Damien could be a problem for Monday [against Liverpool] but I expect Mousa to play."