The former Chelsea man will return to England on loan until New York City FC's season begins and the Arsenal boss wonders whether the system is a Financial Fair Play workaround
City were only able to name a 21-man squad for the Champions League and were also fined and restricted in their transfer spending as European football's governing body deemed them to have breached FFP earlier in 2014.
Manager Manuel Pellegrini confirmed on Saturday that former the Chelsea midfielder will join the Premier League champions on loan until January from City's Major League Soccer franchise, New York City FC.
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The Arsenal boss told the press: "It is a surprise.
"After the statements we hear, it is a surprise but it looks like all of these 'City' clubs will feed the main club, Man City. I heard they want to buy five clubs all over the world.
"I don't know the rules well enough but they brought a franchise for $100 million [£59.4m] to play in the States next season.
"At the moment the players they sign cannot play until next year so they will register them in the clubs where they put them and they can get out on loan.
"Is it a way to get around the fair play? I don't know. We are happy to dedicate the money to just run our club. There is not a lot of surplus to run other clubs."