He was on Sky's couch for the game yesterday - here are some of his quotes:
Pre-match
"Arsenal was always the game as a player. It was the game I looked forward to at the beginning of the season. For players and fans it was like going into battle."
"Paul Scholes is nasty and I like that in him. You need that if you play in the centre of the park."
"This is a big season for Wayne Rooney and we'll see what he's all about. He is a big influence and he likes the big occasions. He is maturing all the time and he has a lot of pressure on him because of England and people need reminding how young he is."
"This is a good test of character for Arsenal. They need a result and you should never write off Arsène Wenger."
"I hope the tackles go flying in - that's what you need in this game. You need to tackle to earn the right to win."
Post-match
"It was frustrating to watch with the result going against United."
"Fábregas was outstanding but I felt there could have been more tackles on him in the middle of the park. I would like to have seen someone hit him a bit earlier in the game."
"What will disappoint the manager was losing with 10 minutes to go. He would have been delighted with a draw before the goal."
"Ronaldo will be criticised for giving the ball away that led to the goal but he is young and learning. The manager and his team-mates will remind him of what he did."