By Sanjeev Shetty BBC Sport Online in Memphis

Emanuel Steward, Lennox Lewis' trainer, has told BBC Sport Online that his fighter will knock out Mike Tyson in two rounds.

Steward, who has admitted that he is very nervous about the fight, believes that no matter what Tyson does on Saturday night here in Memphis, it will not be enough.

Speaking after the Briton weighed in for the fight, Steward said he does not know exactly which Lewis will turn up.

"You see a lot of Lennox Lewis' styles in the ring - you see the one who boxed a very technical fight and made Evander Holyfield chase him round the ring.

"Or you have the guy that went out after Andrew Golota and Francois Botha and took them out.

"I think on Saturday, you will see a combination of those two guys.

The trainer, who has guided dozens of fighters to world titles, says that Lewis will spend the next two days playing chess and stretching his muscles in some light workouts.

And he refused to confirm or deny whether Lewis will hang up his gloves after Saturday.

"I have no idea what Lennox will do. Nothing would surprise me."

Steward says that Lewis has trained to face the best possible Tyson, but they do not expect the destructive machine of the late 1980s to turn up.

"His trainers can try to get the best out of Tyson, but it will not be enough."