Andrey Ryabinsky, the promoter for WBC interim-heavyweight champion Alexander Povetkin, believes Oleksandr Usyk is a bit too small to compete with the big men of the weight class.

Usyk, a former undisputed cruiserweight champion, moved up to heavyweight in 2019 with a stoppage win over late replacement Chazz Witherspoon.

While he obtained the victory, the performance failed to impress the critics.

In the aftermath, Witherspoon explained that Usyk was never able to hurt him in the contest. He blamed physical exhaustion on the loss. 

Usyk returned for his second heavyweight bout in October - picking up a tougher than expected decision win over division veteran Derek Chisora.

Afterwards, Usyk, who holds the number one ranking with the WBO, promised to push forward with his mandatory shot at unified champion Anthony Joshua.

Joshua returned to the ring earlier this month in London and knocked out the IBF's mandatory challenger, Kubrat Pulev, in nine rounds of action.

Usyk stands in the way of a full division unification between Joshua and WBC world champion Tyson Fury.

While Ryabinsky fully respects the boxing ability of Usyk, the Russian promoter believes he's too small to overcome the division's giants like Joshua, Fury and Deontay Wilder.

"Pulev did not make any competition at all, Joshua easily took him out, which, in fact, was [what everyone had expected] before the fight," Ryabinsky told Vasily Konov by phone.

"I think that [Usyk's] chances in fights with guys like Joshua, Tyson Fury, Deontay Wilder are not great. Usyk is just too small for them, but this is his only drawback [as a fighter]. Usyk's school of boxing is simply gorgeous: better than the rest. But he's just small for this weight, he may not have enough power. But the fight between Joshua and Fury is very cool, everyone will want to see that."