Arsenal manager Arsene Wenger says it's "too early" to worry after his side can only manage a 0-0 draw against Sunderland at the Emirates on Saturday.

Wenger admitted his "three striker formula" did not work against a defensively-minded Sunderland but said his side needed to improve the speed of their passing in order to create more space.

The Gunners, playing for the first time without Robin van Persie who signed for Manchester United, struggled in front of goal despite creating the better chances.

Wenger also says the loss of Alex Song will be "frustrating", as the midfielder moves closer to joining Barcelona.