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McGregor claimed the featherweight crown in spectacular fashion at UFC 194, where he recorded a devastating 13-second KO win over Aldo to become the first man from Ireland to win UFC gold.

However, despite having the 145-pound crown in his possession for nearly eight months, 'The Notorious' has failed to defend his title.

Instead of defending his belt, McGregor has opted to test the waters in the welterweight division.

McGregor's decision to fight at welterweight has raised serious questions over his future in the 145-pound weight class.

Aldo, who claimed the interim 145-pound title at UFC 200, is next in line for a crack at 'Mystic Mac' and has been told by UFC president Dana White that the Dubliner will be forced to fight him after his upcoming rematch with Nate Diaz.

(Image: GETTY)

"That's what Dana said, he said during a recent media day in Rio de Janeiro Brazil.

"Dana said his next fight has to be at featherweight, so I'm hopeful.

"I'm thinking about that and hope that is the case. But if it's not, I have no problem.

"I want to be champion. Whoever they put in there, I will win."