The Gunners, linked on Thursday with a move for their former skipper Patrick Vieira on a pay-as-you-play basis, have made just one signing, defender Thomas Vermaelen from Ajax, but have sold both Kolo Toure and Emmanuel Adebayor to Manchester City.
Arsenal are £30million up on the deals but Wenger is in no rush to spend. He told the club's official website: "I feel we are strong enough but if we can add then we will do it.
"In England people think that all the problems can be sorted out by buying players. "I believe the biggest target is to work hard in training, improve what we can improve and have confidence in the players that we have.
"If we need to add then we will. We have money available so for us it is now [important] to spend it in the right way when we do it or if we do it."
Arsenal have refused to comments on the reports about Vieira, who is keen to leave Inter Milan. But former Gunners striker Ian Wright said on his TalkSport radio show: "I'm hearing Vieira, pay-as-you-play, back at Arsenal. That's what I'm hearing, and that's what I'm hoping."