Arsenal boss Arsene Wenger admits Roy Keane has impressed him as Sunderland manager.

"As a player he had the charisma of a leader, so I always knew he would be able to handle players," Wenger said. "What I didn't know was whether he'd have the patience to handle the press and directors and all the rest of it. He has seemed surprisingly calm but you could see towards the end of his playing days that he was trying to tame his more impulsive side."