Charlie Sheen says despite his battles with substance abuse he never showed up drunk or high to the set of the U.S. sitcom "Two and a Half Men."

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Sheen has starred on the CBS comedy for eight seasons, but production was halted last month after he suffered a relapse in his recovery. He is currently undergoing out-patient treatment for addictions to drugs and alcohol.

"The shape I was showing up in was epic, was beyond comprehension," Sheen told DIRECTV's "The Dan Patrick Show" Wednesday.

"(I've) never been drunk, never been high on the set once," he insisted. "But, I would show up not having slept much. Doing a network run-through and asking the director ... to move my mark a little bit so I could be next to a piece of furniture or a table so I wouldn't fall over. That is an expert move by a seasoned professional. I'm sorry, an amateur stays on his mark and then falls over during the run-through."

As for whether he will return to the show after this season wraps, Sheen replied: "Oh God, yeah! Because I have a two-year deal. I'm a man of my word."

The actor told Patrick he has some advice for troubled starlet Lindsay Lohan, who recently was court-ordered to rehab to deal with her addictions to drugs and alcohol.

"You get Lindsay on the show, I will call in," Sheen said. "I've got some advice for her. I've got some things I would recommend she consider because I don't tell anybody what to do. Just try to think things through a little bit before you do them."