Manchester City boss Pep Guardiola is missing the influence of Mikel Arteta since his former assistant left the club to become Arsenal manager.
That's the view of former West Ham striker Carlton Cole, who believes Arteta played a key role in developing good players into great players at City.
Speaking on talkSPORT, Cole said: "Arteta was a massive loss for them [Manchester City] because he made some of their players great players. They came in as good players but he made them great players.
"Arteta, as a first-team coach, was unbelievable for Pep and he's definitely a missing component in that team right now.
"As soon as Arteta left you started to see some frailties. Now he's gone from a first-team coach to the manager [at Arsenal] so we're going to see his tactics but Pep needs someone like Arteta to coach these players and make them better."
Arteta has been widely praised for the work he has done at Arsenal since taking over from Unai Emery and Manchester United legend Roy Keane believes he has changed the culture of the club.
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When asked about Arteta's start to life as a manager ahead of their 3-1 loss to Liverpool at Anfield, Keane told Sky Sports: "He's done great.
I hate using the word culture but he seems to have changed the culture at the club. There seems to be a bit more steel about them.
"There's a long way back for them, obviously, in terms of challenging the top two but the signs have been good and I think winning the FA Cup was a big boost to him.
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"It kind of supports the changes he's been making. He's obviously got rid of one or two players with bad attitudes so it's certainly been a good start for him."
The Gunners currently sit fifth in the Premier League table, with two wins and one loss from their opening three fixtures, and Arteta will be looking to build on last season's eighth placed finish.
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