Conor McGregor was linked to a potential cross-sport summer showdown with retired boxing legend Floyd Mayweather last week, but UFC president Dana White quickly shot down the tabloid report. McGregor's coach John Kavanagh, meanwhile, fueled speculation with a joke on Twitter.

McGregor has previously said he'd be open to fighting the undefeated 39-year-old boxer, and it's easy to see why. A Mayweather-McGregor bout would destroy every single pay per view record, and two men who are very focused on making money would walk away with gigantic checks.

McGregor took things a step further Sunday, posting a Mayweather-McGregor fight poster on his Twitter page.

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MMA Vs Boxing. pic.twitter.com/qgl8tKvT5s

— Conor McGregor (@TheNotoriousMMA) May 8, 2016

Mayweather, who walked away from the sport of boxing after his 49th victory, recently filed for trademarks on the terms TMT 50" and "TBE 50."