Does Conor McGregor calling out Roman Reigns mean anything?

Conor McGregor mentioned SummerSlam, and WWE and UFC are in the process of merging so … just saying.

Crossing over with other fighting sports, WWE has drawn some of the biggest boxing and MMA stars to the squared circle over the years. The likes of Mike Tyson and Tyson Fury have competed in matches while Ken Shamrock and Ronda Rousey (who’s still competing) signed full time.

Arguably MMA’s top talent of the past decade, Conor McGregor has never appeared on WWE programming, despite numerous company mentions on social media over the years. If the opportunity arises, however, the longtime UFC star appears to know what he wants.

Starting Wednesday, McGregor began tweeting messages about Roman Reigns and Paul Heyman when a rumor about the former’s title run went viral.

Since Reigns holds the WWE and Universal Championships, McGregor noted his own multi-title run with the UFC Featherweight and Lightweight Championships. He took it to an audio message, too.

Heyman’s not fighting anyone anytime soon, but McGregor still wants a piece of him anyway.

It seemed playful until McGregor referenced SummerSlam.

“Summerslam I’ll pull in on the yacht. Roman and Paul out the bus,” the 34-year-old legend said.

This could merely be a fun social media exercise since Endeavor owns WWE and UFC. It goes viral, gets people talking, and creates some speculation.

But, again, Endeavor owns WWE and UFC. Could McGregor actually make his WWE debut at SummerSlam?

McGregor keeps tweeting about the “I’ve held two world titles before you” aspect, which may be all that is needed to make this work, along with additional intrigue for what he could do in his WWE debut.

Such a move would be a massive draw for SummerSlam, which takes place at Ford Field this year and holds roughly 65,000 people — a WrestleMania-sized venue fit for a megastar in the fighting world like McGregor.

Right now, there’s no logical SummerSlam challenger for Reigns since he and Cody Rhodes are on different brands. No one else is being built to Rhodes’ level, so could McGregor vs. Reigns in a non-title match actually happen? It’s crazy, but the stars could align.