MIKE TYSON will be up for “manslaughter” if he fights Sonny Bill Williams, claimed former trainer Jeff Fenech.

The 53-year-old has been offered $1million to come out of retirement to face the All Blacks legend, Paul Gallen or Barry Hall.

But Fenech has urged them not to step into the ring with the heavyweight legend unless they want to end up in a morgue.

He told Sydney Morning Herald: “Let me tell you something. If he hits Sonny Bill Williams or Paul Gallen, he will be up for manslaughter.

“I’m serious. If he punched Paul Gallen, he could kill him.

“These guys have never been punched by somebody like Mike.

“You see what he’s doing to the pads, imagine Mike hitting one of those guys with one of those uppercuts.

“More than likely they will be in the morgue the next day.

“Fighting Sonny Bill? Who has Sonny Bill fought? Sonny Bill won’t even fight Paul Gallen because I don’t believe he can beat him.”

Fenech also claimed Tyson is worth a lot more than the $1million offered by Australian boxing promoter Brian Amatruda.

He said: “Great publicity, but it’s not going to happen, they’re offering him half a million or a million dollars.