Wenger also denied Arsenal have slipped further behind Chelsea and Manchester United this summer.
He said: "I believe we are good enough to win the title. I think we're better than the other two.
"We're in a tricky situation because people want to see big-name signings but they also want to see good young players coming through.
"The only way young players like Denilson, Walcott and Djourou can develop is by playing in the team."