By Carlos Boogs

Former four division world champion Roy Jones Jr. has once again jumped aboard the Boxing vs. MMA train.

Long before Floyd Mayweather Jr. and Conor McGregor began pressing each other for a cross-sports battle, Jones and UFC star Anderson Silva were calling each other out for a showdown the boxing ring.

Last week, Jones - at 48 year old - continued his career with a stoppage win over Bobby Gunn. Silva, 41 years old, was back in the cage on February 11 and picked up his first official win since 2012.

On Wednesday night, Jones was back on the horse and called for the fight with Silva. He wants the fight with Silva to become the co-feature to a potential Mayweather vs. McGregor clash.

"Roy Jones vs Anderson Silva  and Mayweather vs McGregor double headline card UFC invasion. Would be biggest event of all time period," Jones told his social media followers.

A fight between Jones and Silva would face the same obstacle as Mayweather vs. McGregor - the UFC has both of the MMA stars under exclusive contracts and will not allow them to step around those agreements for boxing fights.

Years ago, UFC President Dana White would not allow Silva to fight Jones - and more recently, White threatened legal action if McGregor attempted to move forward with a fight against Mayweather.

Last fall, Jones discussed the idea of doing a Boxing vs. MMA doubleheader.

"It was so big when it was talked about back then with me, it would have been the biggest fight of my career by far, I know. It would have been the biggest fight of my career. Dana didn't want to do it, but he's not the owner now. People make decisions usually try to make money for their decisions. These two fighting [Mayweather and McGregor], like me and [Silva] fighting in a boxing match, will not diminish the UFC brand," Jones said.

"That fight with James Toney, when he lost to Randy Couture, that didn't diminish boxing. Of course he's not going to beat Randy Couture with what Randy does. Unless he goes out and learns how to do that and takes time to learn how to fight like that, of course you're not going to beat him. Most of these fighters like Conor train in boxing, so their chances to beat a boxer is better than a boxer's chances who doesn't train at UFC at all, to beat a UFC guy.  As we saw, Toney didn't train in the UFC [style fighting] at all. You're not going to beat him like that. I don't see how it would hurt the [UFC] brand."

"Those UFC fans are die-hard fans. They believe in their guys, which is why I was trying so hard to fight Anderson Silva - because I knew the whole UFC crowd was gonna watch it. They want to see if he's gonna get lucky and land one [punch]. And seeing that you're older, you can get lucky and get him. They are all going to watch, because they are thinking maybe he can do it."