Oleksandr Usyk can be a "serious threat" at heavyweight, if he moves up a division after his knockout win over Tony Bellew, says Sky Sports expert Carl Froch.
Froch told Sky Sports Box Office: "He is a serious threat to the heavyweight division, you can say that. I would just like to say that Tony Bellew really put up a top performance, probably one of the career-best performances, but he came up against a fantastic Usyk tonight.
"I think because of the sheer size of him, and the fact he boxed at heavyweight as an amateur, I think he can make that transition very well, but it has to be a steady one," said Froch.
"He needs to choose his enemies wisely early on, and then we know he's looking for big AJ, that may be too ambitious.