He only scored six more goals for the club after that and ended last season well out of favour. But Claudio Ranieri was replaced by Jose Mourinho and Mutu was gifted another chance.
But his behaviour was not to Jose's liking, and the Romanian striker made only two substitute appearances this season. Now, he will never be seen in a Chelsea shirt again...
A Chelsea statement read: "We want to make clear that Chelsea has a zero tolerance policy towards drugs.
"This applies to both performance-enhancing drugs or so-called 'recreational' drugs. They have no place at our club or in sport.
"In coming to a decision on this case, Chelsea believed the club's social responsibility to its fans, players, employees and other stakeholders in football regarding drugs was more important than the major financial considerations to the company.
"Any player who takes drugs breaches his contract with the club as well as FA rules. The club totally supports the FA in strong action on all drugs cases.''