Arsenal boss Arsene Wenger has warned Manchester United youngsters Danny Welbeck and Javier Hernandez over their playing chances this season. Wenger lost Robin van Persie to United yesterday.

"Alex Ferguson is a bit too confident when he speaks of '99," said Wenger. "But, of course, it increases their potential offensively because they've got a world-class player.

"They have as well a number of players, like Danny Welbeck and Javier Hernandez, who will have restricted chances to play."