McGregor stars in cringeworthy fast food ad

Conor McGregor has taken a cheeky swipe at several high-profile sports stars after starring in a cringeworthy advertisement for fast food chain Burger King.

McGregor was in peak trolling mode as he directed a cheeky dig at Cristiano Ronaldo, while also taking aim at familiar foe Floyd Mayweather Jr and rap star 50 Cent, all in one typically brash Instagram post.

The big-talking UFC star has landed a lucrative endorsement deal with Burger King and claimed he has now surpassed Real Madrid's Ronaldo on Forbes' list of highest-paid athletes.

McGregor said he promised Ronaldo he would do so when the pair trained together in 2016.

Writing on Instagram, he said: "Making deals and TAKING deals! Kings recognise Kings!

"I am also really interested to see this years [sic] Forbes highest paid athletes list.

"I have now surpassed Cristiano Ronaldo as I told him I would in 2016."

Mayweather, who defeated McGregor in a lucrative Las Vegas boxing bout last year and is rumoured to be considering facing the Irishman in the MMA octagon, was also typically on McGregor's hit list.

"Floyd as a retired fighter that makes ZERO substantial revenue outside of them ropes is not on the list, and in the long game, is already dead.

"Mixed Martial Arts is a glorious game, Floyd. You are going to love it hahaha."

McGregor extended his reach beyond the world of sport, though, finding time to comment on hip hop stars Jay-Z and Diddy (formerly known as Puff Daddy and P Diddy, among other monikers), and directing barbs at 50 Cent – who he claims blocked him on Instagram.

"Congrats to Jay-Z on his No.1 takeover from Diddy in the highest paid Forbes list. What a take-over!" He added.

"Diddy hasn't been number 2 in so long. Until now. Zoom into that two tone with the powder blue on my wrist mate. You might see 1st place again.

"Someone tag 50 Cent in this for me," he wrote. "He blocked me on this the mad 50-year-old Instagram blocker.

"Ahh don't block me 50 kid, I still like some of your songs. The older ones hahah."

The trash-talking Irishman posted a video of the ad to social media, where he also took aim at UFC stars Tony Ferguson and Khabib Nurmagomedov - who famously referred to him as a "McNugget" a "chicken" respectively.

"Forget Floyd (Mayweather), forget Nate (Diaz), forget Khabib (Nurmagomedov) and forget Tony (Ferguson)," the lightweight champion wrote alongside the video on Instagram.

"I I finally found a real contender who can bring the heat," McGregor said in reference to the burger he was shamelessly plugging.