Arsenal boss Arsene Wenger admits Robert Pires could be Villarreal's big danger ahead of their Champions League quarterfinal tie.

Pires, 35, left the Gunners in 2006 after helping the North London club to the Champions League final.

"We have to keep him quiet because he is a guy who can make a difference," said Wenger. "He is playing very well. He is 36 in 2009 and is still playing so that shows you what a fantastic player he is."