McGregor is in deep heartache.

Conor McGregor, the former UFC champion in two weight classes, has admitted to feeling deep heartache over not being able to fight at UFC 303.

"I'd be lying if I told you I don't feel deep pain right now watching the week of fights. This is deep heartache. Thank you for your messages of support and encouragement, my fans and supporters," Conor wrote on social media.

Recall, McGregor withdrew from the fight against Michael Chandler, which was to headline UFC 303, due to a fractured pinky toe.