But Sutton feels the move was a 'no brainer' for the Gunners as they prepare to snap up a player of his huge pedigree and experience - saying he could be the difference maker in their bid to win the title.
'I'm surprised he's gone to Arsenal and Chelsea are helping Arsenal,' he told Transfer Confidential. 'I think, from Arsenal's point of view, he may be the signing which helps him win the Premier League. I think that he's a really talented player.
'This looks like a compromise because they're saying "we're not going to get Moises Caicedo and we're not going to get Declan Rice in this window". At 31 it's a good piece of business, for £10m or £12m it's cheap as chips.
'From Arsenal's point of view, that's a 10. I I really think that's a no brainer and a smart piece of business.'
However, Sutton was less impressed by Manchester City letting Joao Cancelo join Bayern Munich on loan after he fell out with Pep Guardiola over his game time and attitude.
Cancelo - widely regarded as one of the world's best wing-backs - completed his move to the Allianz Arena on deadline day, with the Germans having the option to sign him permanently for £61m.
'Joao Cancelo - that move to Bayern Munich, that has come out of absolutely nowhere,' he added. I think if you're at Manchester City fan, you are really concerned about this now. Manchester City may end up bringing a replacement in, but I think most City fans would regard Cancelo as their best full back.
'OK, he hasn't hit the ground running since coming back from the World Cup, but it looks like there has been some sort of altercation [with Guardiola] - there must have been, because otherwise Pep would be bonkers to get rid of Cancelo.
'The numbers are pretty good in terms of what they're gonna get for him. But having said that, Man City are in a title race, and Arsenal are going to push them all the way so why would you want to get rid of [one of] your best players?
'How it's panning out for Manchester City, unless they bring in a top replacement, I'd say that's a one out of 10 for Manchester City. That's an absolute nightmare!'
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