McGregor was born in Dublin, Ireland to Tony and Margaret McGregor.[1] He was raised in the South Dublin suburb of Crumlin and attended a Gaelscoil and Gaelcholáiste at both primary and at secondary level in Coláiste de hÍde in Tallaght, where he also developed his passion for sport playing association football. In his youth, he played football for Lourdes Celtic Football Club.[11]
McGregor took up kickboxing and at the age of 12, he began boxing at Crumlin Boxing Club under two-time Olympian Phil Sutcliffe[12][13] where he often trained alongside Dean Byrne and Jamie Kavanagh, both of whom went on to train at Wild Card Gym under Freddie Roach. McGregor later became an All-Ireland boxing champion at the youth level.[12][14], i think the problem will be that mcgregor knows how to box and mayweather would kill him in a straight boxing match but if its a mma match mcgregor has years of experience that there is no way mayweather can match.