With only a week left before their upfront presentation, the clock is ticking for Warner Bros. and CBS to find a Charlie Sheen replacement for their hit show “Two and a Half Men.”

According to The Hollywood Reporter, CBS, Warner Bros, and “Men” executive producer Chuck Lorre have set their sights on a new unidentified actor to replace Sheen after Hollywood veteran Hugh Grant passed on the role.

Back in April, Lorre had hatched a plan to reboot TV’s most-watched sitcom without Sheen, who was fired in the wake of his public meltdown and verbal tirade against Lorre and other studio executives.

The studio and network would like to have an actor in place before CBS’ annual upfront presentation to advertisers May 18th in New York, though sources say the network could still choose to hold off Men until mid-season or — in a worst-case scenario — cancel the show entirely, which is highly unlikely, given the hundreds of millions of dollars at stake for CBS and WB.