The Cameroon international left the Gunners for the Catalan giants in the summer.
"I am who I am thanks to him," he told Barca Magazine.
"When I came to England, he was a big help to me. I was very young, just 17, not 25 like I am now. Wenger was like a father to me.
"It was very hard for me at first because I had left my family behind in France, and so he treated me like a son.
"I have a great relationship with Wenger. I want to thank him for believing in me. I want to give him back everything he gave me I'm sure he's happy to see where I am now and the kind of player I have become.
"He always said 'do you remember your first touches of the ball when you came to Arsenal? They're not the same as they are now'. And I'd answer 'you're right. They're certainly not the same as they are now'."