The Ukrainian and the Briton will fight for all heavyweight belts on May 18 on Boxing Night in Riyadh, Saudi Arabia.
"I think Usik knows what he needs to do. This guy is a champion, an absolute champion in the undercard, who has moved up to the heaviest division. He's a winner and he hasn't had a defeat yet. I'm sure he has a plan. He wouldn't step into the ring without a plan. It's up to us to see that plan come to fruition," Lewis said in an interview with talkSPORT YouTube channel.
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Allen gave a prediction for the fight Usyk - Fury 2