Robin Van Persie
Selling the Dutchman to a rival club left many Arsenal fans angry and dumbfounded and the forward’s 30 goal return in his first season led to a Premier League title and confirmed that Wenger had sold a player still in his pomp to Sir Alex Ferguson, who gladly welcomed the prolific marksman.
The striker had publicly stated his intention to not sign a new contract but at the same time Arsenal could have used his services for another season.
Instead he allowed the striker to complete a £24m move to Old Trafford.