The pair have joked about getting in the ring previously, but Chandler has now called his older brother out, and he's backing himself too.
At 1.96m and 120kg, Chandler has both a height and weight advantage over Jon, but that's unlikely to have much of an impact on the result… unless Jon has a hand tied behind his back.
"Me and my brother used to fight all the time when we were young and I'm pretty sure I can take him down now. I am way bigger than he is," Chandler told TMZ.
"It will be fun if we actually did a one-round match for charity … that would be fun. If I win, he would have to donate to the charity of my choice and vice versa."
However, Chandler is realistic about the chances of the bout becoming a reality, musing: "I don't know how my coach would feel about it. I don't think it would fly."