Flamini, 29, spent five years in Italy after leaving the Gunners in 2008.
"I had the opportunity to go over there and play with legends," Flamini told arsenal.com.
"I played with Maldini, with Kaka, with Ronaldinho and even David Beckham over there.
"I had the chance to learn a lot. The mentality and the approach to football over there is completely different. The game is completely different too."
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