Usyk is set to fight Anthony Joshua after plans collapsed for a bout with Tyson Fury but Whyte doesn't think he can compete with the world champion.
He told Sky Sports: "It's a dead fight. Usyk hasn't looked good.
"Who has he fought at heavyweight? Chazz Witherspoon, Derek Chisora. He looked terrible in the fights. He has no punch power.
"Okay, he's got good movement, but it's not nice movement. At cruiserweight his movement was nice, but at heavyweight, his movement is not nice. It's just so negative.
"The Derek Chisora fight, I watched the first six rounds and when Derek tired, I was like, this is rubbish. Derek was out on his feet and he couldn't even stop him. He was punching him clean and Derek was walking through.
"Usyk is not a true heavyweight contender."
Whyte lost to Joshua a number of years ago but feels he would pose more of a challenge than Usyk in a rematch.
He said: "You can say what you want about me, but there are two things that they cannot deny. I always come to fight and anyone that fights me, you will know that you've been in a fight, regardless, win, lose or draw.
"The two fights I lost, the guys took major damage.
"Anthony Joshua almost got knocked out when I fought him. If you watch the clips back you hear him saying, 'If I took one more body shot from him, I would have folded in half'.
"These guys know regardless, win, lose or draw. I come to give work."