UFC fighter Kelvin Gastelum has labeled Conor McGregor a "leper" following recent newspaper allegations he fathered a child with an English woman.

Gastelum was responding to the Dubliner poking fun at his recent illness.

The American declared himself the "undisputed UFC Middleweight Champion" after his opponent, Robert Whittaker,  pulled out of their world title fight at UFC 234 last weekend.

Read More: Conor McGregor picks beautiful Irish-language name for his new daughter

Unimpressed with Gastelum's antics as well as wearing a title belt for interviews, McGregor blasted the fighter on his Twitter account.

UFC fighter Kelvin Gastelum has labeled Conor McGregor as a "leper" in response to the Dubliner attacking him on Twitter. Image: Getty.

UFC fighter Kelvin Gastelum has labeled Conor McGregor as a "leper" in response to the Dubliner attacking him on Twitter. Image: Getty.

Gastelum had been battling staph infections on his face and body leading up to the bout but had been cleared to compete.

Nevertheless, McGregor took to social media to say:

"Why is that worm holding the 185lb belt? There are worms crawling on his skin! It was absolutely ludicrous to even consider allowing him to compete.

"Let alone now walk around the arena shaking our fans hands. Someone sort this, this instant. And sterilize that belt.

"Immediately."

Why is that worm holding the 185lb belt? There are worms crawling on his skin! It was absolutely ludicrous to even consider allowing him to compete. Let alone now walk around the arena shaking our fans hands.
Someone sort this, this instant. And sterilize that belt.
Immediately.

— Conor McGregor (@TheNotoriousMMA) February 10, 2019

Read More: Conor McGregor named as secret father of baby by former friend

"Oh my God, you want to talk about a leper?" Gastelum told ESPN when asked about McGregor’s comments. 

"A guy that’s full of disease that’s spreading disease all over Ireland? That’s Conor McGregor.

McGregor has two children with his long-term partner, Dee Devlin. Image: Instagram.

McGregor has two children with his long-term partner, Dee Devlin. Image: Instagram.

"He’s spreading his seed all over Ireland, impregnating ladies and not claiming them. That dude’s a leper. Forget him," he added.

Gastelum was likely referring to recent newspaper reports which allege McGregor had fathered a child with an English woman.

"The Notorious," has been in a long-term relationship with partner Dee Devlin for many years and they have two children together.

Read More: I’m done with The Notorious Conor McGregor

What are your thoughts on the recent events surrounding Conor McGregor?
Let us know in the comments below.

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Mcgregor before fighting Floyd MayweatherGetty Images