McCallany, who has previously said that fighters enjoy the series, told Collider that some famous faces have asked for cameos in the FX series.
"One of the most gratifying things to me about this whole experience was that the real fighters have really embraced the show," he said.
"A lot of the real guys really like the show a lot. Lennox Lewis wants to come on. Sugar Ray Leonard wants to come on. Gerry Cooney brings it up to me every time I see him. So if that's any indication of what they think of the show, they not only love the show but they'd love to come work with us and do anything."
Meanwhile, McCallany's co-star Warren Leight suggested that the series shows a different side of boxers.
"A couple of the guys have said, 'Thanks for telling our story'," he said. "People think we all know boxers from the moment they step into the ring until the end of the fight. But these guys live full lives and they're not brutes. They're complicated guys with gentle sides and tough lives and no union protection and they're in with a den of thieves.
"We try to tell that story as realistically as we can. A number of guys have said, 'Thanks for showing more than what they usually show', which we take some pride in."
Lights Out airs on Tuesdays at 10pm on FX.
> FX president pledges Lights Out support