The Serbia & Montenegro international signed a deal with the club last week, but was waiting for confirmation that he would be granted a work permit by the Home Office.
"I'm very glad that I'm here, it's a fantastic club with a great history and has a good team," Kezman told Chelsea's website.
"I've got the best record in the history of the club (PSV). I just need some time and (Chelsea's) supporters need to be patient, but I'm sure it'll be okay."
New Chelsea boss Jose Mourinho has already indicated his pleasure at bagging one Europe's top strikers - and is ready to slot him into his plans for the coming season.
25-year-old Kezman faces major competition for the striker spots in the starting XI - with Eidur Gudjohnsen, Hernan Crespo and Adrian Mutu all in contention.
Mourinho has already indicated that Gudjohnsen has impressed in training, whilst Crespo's future is still unclear.
Should the Argentine leave Stamford Bridge, it appears that Didier Drogba will be targeted by The Blues.
"I like Kezman because he is not yet a top world star," said Mourinho to Sky Sports News. "But he already scoring more goals than many accepted world stars.
"He will work for the team."
