Los Angeles - Tracy Morgan has returned to work on Tuesday after recovering from his collapse at the Sundance Film Festival.
The 43-year-old actor was rushed to the Park City Medical Centre in Park City, Utah after he passed out following an awards ceremony on Sunday but Tracy - who claimed the altitude affected him - has insisted he is fine and will begin shooting new scenes for TV show 30 Rock today.
He wrote on Twitter on Monday: "Superman ran into a little kryptonite. The high altitude in Utah shook up this kid from Brooklyn.
"Thank U 2 the hospital staff. Back at work 2morrow shooting 30 Rock. Holla at me!
"Gotta thank the AMAZING medical staff and all my supporters! Love you. #GOgiants @Giants #ALLIN (sic)."
No drugs or alcohol
Ron Nyswaner - the co-director of Tracy's new movie Predisposed - blamed a combination of altitude sickness and complications with the actor's diabetes for the collapse.
He explained: "[It was] altitude sickness combined with his diabetes. And he hadn't eaten. He hadn't had enough water".
It had been reported that the recovering alcoholic seemed out of control at dinner, where he is said to have been shouting and falling over but a spokesperson for the hospital said no drugs or alcohol were found in his system.