3. William Gallas
Former French defender Willian Gallas joined Arsenal from their London rivals Chelsea FC in September 2006, having previously won the Premier League twice with the Blues.
He spent four years at the Emirates, making 142 appearances for the club in all competitions. However, the Frenchman betrayed the Arsenal fans as well when he joined Tottenham in August 2010.
At White Heard Lane, Gallas spent three years before spending his final season as a professional in the Australian A-League, representing Perth Glory in 2013-14.