The 29-year-old former Arsenal player has bagged eight league goals so far this season but wants Lorient to improve against the weaker teams in the division.
"It is difficult to say how far we can realistically go because we have been quite inconsistent," Ligue1.com quotes Aliadiere as saying.
"I know we have a really good team and good talent but it seems that when we play bigger teams we do better and when we play smaller teams who are fighting for their lives we kind of struggle.
"Obviously we are very close to fourth or fifth place so winning against Rennes will give us confidence and will see us go in front of them. So it would be a great thing if we could beat them."
Lorient host Rennes on Saturday afternoon.