Charles Martin ousted Deontay Wilder and claimed the former WBC heavyweight champion lacked ‘a lot of areas’.
The American heavyweight has twice talked about bringing it inside the ring during 2020.
But they ended when the Bronze Bomber won an arbitration case that secured their trilogy clash against Tyson Fury.
The 36-year-old was thrashed by the Gypsy King and has since shown signs of retirement.
Meanwhile, Martin will face Luis Ortiz at the IBF Eliminator on January 1, as he prepares to appear in the picture of the world title.
Earlier, Martin told Sky Sports about that potential performance with Wilder, insisting that the star was confident of victory given the many things he lacked in his skills.
Martin, 35, said: “It would have been a good opportunity.
“I always knew that there was a possibility that things would not turn out in my favor, but I still prepared myself mentally.
Free bets: Receive over £2,000 in new customer deals
“I was able to treat it like a championship fight. I tried 100 percent knowing it was likely to fall.”
Martin said: “He lacks in a lot of areas. I’m pretty hard to hit. You can’t hit me flush because I never get in. [straight], I’m always strategic.”
Martin was recently in talks to face another former world champion in Andy Ruiz Jr.
But his potential performance took a hit when the Mexican was forced to undergo knee surgery.
The veteran’s final outing resulted in a one-punch knockout of former world title challenger Gerald Washington.