Jeremy Piven says the 'Entourage' movie will have more celebrity cameos than ever before.

The 48-year-old actor is back on the big screen next June as hyperactive Hollywood agent Ari Gold and has revealed the future blockbuster is packed with so many A-list appearances that the film would make the perfect drinking game fodder.

The hit HBO show, which ran from 2004 to 2011, is famed for its guest appearances from the likes of Mandy Moore, Jessica Alba, Eminem and Matt Damon, and the movie version sounds like it won't disappoint.

Jeremy said during the first TimesTalks London event: ''I think the movie will be really satisfying. I had a lot of fun doing it and revisiting that character. It was exhausting, even more so. Loaded with cameos, so many that I think if it was a drinking game, you'd be drunk 18 minutes in.

''Liam Neeson would show up and be so self deprecating, playing [himself]. Mark Wahlberg is back, Pharrell Williams, every American sports star that you can think of, Mike Tyson... Every day there was a new cameo ... We added actors like Billy Bob Thornton who's playing this billionaire tycoon, he was an absolute genius.''

Fresh from wrapping filming for the movie with his co-stars Adrian Grenier, Kevin Connolly, Kevin Dillon and Jerry Ferrara, Jeremy was reluctant to give any secrets away but admitted creator Doug Ellin did a fantastic job of adapting the TV show.

He said: ''Doug Ellin was presented with a very beautiful task - how do you turn this series that was viewed all around the globe into a two hour film? I think he did that brilliantly. If you look at the 'Entourage' series there are no close-ups, the camera was never on stilts, there was always a lot of movement.

''Doug wanted to take it to the next level ... It's going to be fascinating for me to see how it plays out. That's our job. To explore and heighten everything that 'Entourage' was.''

Jeremy was speaking in conversation with International New York culture editor Julie Bloom at the TimesTalks London event last week.