Parlour told talkSPORT: "Flamini has been a massive signing.
"The midfield has always been very good, but they were all very similar players. The likes of [Santi] Cazorla, [Mikel] Arteta are really good on the ball, but they had no one in there bossing everyone around. Now suddenly Flamini has gone in there and he is starting to pull people around.
"Before he left for AC Milan he was fantastic. Now he is doing a very similar role and giving it to Ozil, Cazorla. He has been a real unsung hero so far.
"These sort of players do their jobs well but go unseen. He has been a really important player that has come into the club and gone on from where he left. He could be the difference this season."
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