Conor McGregor used racial slurs in a now-deleted furious tirade on social media aimed at rival Khabib Nurmagomedov.
The pair have a long-standing rivalry, with Nurmagomedov having beaten McGregor at UFC 229 in 2018.
McGregor had previously questioned Hughes’ Northern Ireland upbringing and called him a traitor in a series of since-deleted social media posts.