Flamini arrived in the summer on a free transfer from AC Milan.
"Everybody is talking about Mesut Ozil, with good reason, but as I said months ago I was very pleased to see the return of Flamini at Arsenal," Petit told talkSPORT. "Since the time Cesc Fabregas was there they have missed the big guns in midfield.
"They needed Ozil but they were also missing a defensive midfielder, just in front of the back four.
"Now, with those two players, they have found the right balance and can enjoy their football."
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