Djourou said: "We have to be in the Champions League. It would be unthinkable not to be.
"We've been in this situation before against Celtic and it wasn't ideal, but we got the job done.
"We have to make sure we get through the play-off. We are quite capable of doing it - we have nothing to fear.
"We know last season was not the best but we have a chance to put that behind us now and have some success."