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When Conor McGregor named Kieran Tierney as his favourite footballer at a press conference in Russia in October, it was just another example of the pair's rapport.
While on the face of it an unlikely sporting friendship, UFC fighter McGregor formed a bond with Tierney while our left-back was playing for former club Celtic.
Tierney admits that he's a massive fan of the Irish mixed martial artist – and is sure to be tuning in when he makes his return at UFC246 on Saturday.
"I met him in Belfast at a UFC event and that's what started it off," Tierney told Arsenal Player.