The cast of the award-winning series appeared at the TCA tour yesterday to talk about the show's eighth and last season and the possibility of a movie spinoff.
Grenier told reporters: "We're all choked up. We've been together for eight years. We've spent countless hours creating something we're very proud of. It's sad to say goodbye to each other and to what we created.
"We know we'll always be connected on some level."
Entourage creator Doug Ellin reiterated plans for a big-screen outing for Vince and his gang, commenting: "We're going to do it. It's a question of when and how quick. We'll sit down and come up with an idea."
Exec Mark Wahlberg added: "I certainly hope it has a chance to become a feature film, everybody always says the episodes are too short. Viewers want to go on a journey."
The final season of Entourage is airing on HBO in the US and Sky Atlantic in the UK.
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Watch a preview of Entourage's final season below: