Arrived: Bastia, 2004, £1 million
Departed: Barcelona, 2012, £15 million
Another player who proves Wenger’s transfer policy is a successful one as Song was plucked out of obscurity as an 18-year-old in 2004. He spent time on loan at Charlton but made his breakthrough in the 2008/09 season, establishing himself as a destructive central midfielder. Song also developed his ball-playing skills and ended up providing 11 assists last season as he proved himself to be one of Arsenal’s key players in a tough year for the club. His move to Barcelona is therefore a huge blow to the Gunners and Song could prove difficult to replace in the long run. Whether he will play at the Nou Camp is another question, but he possesses all the attributes to succeed in La Liga.