Lewis and Tyson are due to appear at a news conference on Tuesday in New York with the title date pencilled in for April 6 in Las Vegas but they could meet again in October.

"A re-match clause is already written into the contract," Anderson said. "There will be more details on Tuesday but obviously it makes sense for a re-match from a business and a sporting sense.

"It is fair to say this will be the biggest fight income of all time. The figures will be high.

"It is a very exciting time and we are delighted as it looks as though it's coming around.

"The date of April 6 is not set in stone. There is still some negotiating to be done on the venue but obviously it will be in America."

Recent pictures of Tyson show that he has piled on the pounds. But his trainer Tommy Brookes says he is not worried.

"Mike has been waiting for this for a long time," said Brookes.

"He is like a hungry bulldog chasing a meat truck. He is working with our strength and endurance coach so he has taken off a few pounds and I am going to go to see him on February 1.

"Mike has been big all his life. It doesn't bother me at all.

"This is two gladiators meeting. Both guys have been to the big dance a lot of times and I don't think Lennox will take Mike lightly."