Luis Suarez:
He is definitely one of the biggest mistake of Wenger’s managerial career. The North London club missed out on the Uruguay sensation after bidding just one pound over his £40m release clause. It was not very well received by Liverpool and after speaking to club captain Steven Gerrard, Suarez stayed at Anfield. In the following season he almost fired Liverpool to the title before moving to Barcelona for a whooping £75 million.