"It is unfair some teams have played, for example, Newcastle already and then some still have to face a side with six or eight new players," said Wenger.
"I don't worry - what I worry about is getting the injured players back fit and getting the players at this club to perform to full potential," he said.
"We don't expect any miracle from outside, we want to make things happen from inside. If someone else can strengthen our squad we will of course do it, but we have the resources inside to do well.
"We have two players in every position and that should basically be enough, but if we find top-class players in any position we never refuse to strengthen our squad."