4) Thierry Henry
The Frenchman was a relative unknown when he made the move to Arsenal, despite a decent showing at the 1998 World Cup.
It was seen as a bit of a risky transfer by Arsene Wenger as he had just seen his compatriot fail to make the grade at Juventus.
The Gunners boss transformed Henry however, turning him into one of the greatest strikers to have ever lived.