According to The Hollywood Reporter, it looks like "Gary Cole is set to join HBO's comedy Entourage as a regular next season, playing Hollywood agent Andrew Klein, Ari's (Jeremy Piven) oldest Hollywood friend from their early days in the business."

In the show, "Cole is introducing the character this season in a three-episode arc slated to air in November."

Entourage was recently "picked up for a sixth season to begin production in early 2009 for a summer launch."

Evan Jacobs at Movieweb
Evan Jacobs