Getty Images Conor McGregor's coach John Kavanagh told Business Insider his fighter is "arguably the best in the world." McGregor has suffered back-to-back defeats in boxing and MMA since becoming a two-weight UFC champion. He was beaten last year by the reigning lightweight champion Khabib Nurmagomedov, who Kavanagh acknowledged as a dominant athlete. But Kavanagh remains excited whenever McGregor is in the Straight Blast Gym in Dublin, as he learns every time they train together. Visit Business Insider's homepage for more stories. DUBLIN — Conor McGregor's coach still thinks he's the best fighter in the world despite his heavy beating by Khabib Nurmagomedov last year. "I believe he's arguably the best in the world," John Kavanagh recently told Business Insider at the Straight Blast Gym in Dublin.See the rest of the story at Business InsiderNOW WATCH: Statistics tell us today's NBA teams would beat the 1996 BullsSee Also:Khabib Nurmagomedov doesn't even have a fight scheduled but is keeping fit by swimming against the tide in a cold river in DagestanConor McGregor has been linked with comeback bouts against 4 fighters only weeks after being considered an 'irrelevant' has-beenMeet Diego Rossi: The unheralded 21-year-old 'quarterback' who has steered Los Angeles FC's march toward the MLS Cup