Conor McGregor will be remembered as one of the biggest mixed martial arts stars of all time, but one of his greatest rivals says he's heading down a dark path - one that can be altered if the former two-division champion is willing to change.

Khabib Nurmagomedov has said he believes Conor McGregor has a “chance to come back” from the chaos of the last few years, in a surprising message to his bitter UFC rival.