City have spent more than £300 million on new players since Sheikh Mansour bin Zayed Al Nahyan bought the club in September 2008. This week Sir Alex Ferguson expressed his concern over 'kamikaze spending' but Wenger is not shocked by City's outlay.
He told arsenal.com: "We cannot be surprised because we knew once Abu Dhabi bought City, that at some stage [they would spend big money].
"Don't forget they offered to buy Kaka one and a half years ago. We can't be surprised now if they spend money. In fact we would be surprised if they don't spend money.
"But there must be a plan in it. Mancini is not stupid. He is an intelligent guy and he has his idea behind his buys."