He told the Daily Mail: "My opinion at first is that loads of ex-players are making a book, it's sort of fashion to write a book, which I will personally not do. That is his opinion, he can have that. I'm not really going into that. He can think what he wants.
"Arsene is a great coach and manager and fantastic person and helped me to improve as a player and a human. I'm forever grateful for that. I worked eight years under him, he gave me chances.
"On a private matter, he was always open to chat to me about life and as a person as well, and as a coach he was great. He was fantastic. He really had a philosophy. He always wanted to attack, play positive, pass, create and play together.
"Some people judge him just on trophies, like whatever, Per now is finding a reason. He can say what he wants to say.
"He has his way of playing. Arsene did that as well. He was great."