Mike Tyson said tiredness was the reason for a bizarre appearance on “Good Morning Britain” that left some viewers questioning if he was high on drugs – and others concerned for his wellbeing.

On an endless promotional tour ahead of his return to the ring, Tyson was incoherent and hard to watch as he mumbled his way through an interview with hosts Piers Morgan and Susanna Reid.

“I just wanna do this, I plan on doing this for a charity (inaudible),” Tyson began one response. “And I think I’m capable of doing that and that’s what I wanna do.”

The 54-year-old has put his body through a punishing training regime to lose 130 pounds in preparation for an exhibition fight against fellow boxing legend Roy Jones Jr. next month.

And the former heavyweight champion said it was late-night exhaustion that led to a series of slurred answers.

“Hey mate … I tried to stay up late for interview but fell asleep and like a lion I’m hard to wake once asleep,” Tyson tweeted to Morgan. “Training hard and going to bed early. I had no monitor so I couldn’t see you guys and forgot to look into camera.”

“No problem, Champ,” Morgan replied. “We could see you were a bit weary! It was very late in LA. Appreciate this message as some viewers were concerned.”