Boxing promoter Eddie Hearn has questioned whether a return to the ring for Mike Tyson at 53 would be ethical.
A video posted on Tyson's Instagram this week showed the former world heavyweight champion in training and he has said he could make a comeback for charity exhibition bouts.
Hearn admitted he had been approached about promoting a fight for Tyson, but is concerned about the responsibility of making money from ageing fighters.
"I would probably like to see it but I feel is it a bit irresponsible to let a 53-year-old legend back in the ring?" Hearn told British Boxing Television.
"What's compelling is could he actually go back in at 53 and do some damage. But should we be encouraging that from an all-time great?
"There's a fine line - and I've crossed it a couple of times - between integrity of the sport and entertainment delivering numbers. Our job is to deliver numbers for broadcasters but we have to keep it as close to the right mark as we can."