UFC lightweight champion Khabib Nurmagomedov was an interested spectator as Kylian Mbappe put Barcelona to the sword in the Uefa Champions League on Tuesday night – and even departed with the hat-trick star’s signed shirt. Nurmagomedov, a long-time Real Madrid fan, watched from the stands at the Nou Camp, when <a href="https://www.thenationalnews.com/sport/football/one-of-the-best-in-the-world-mbappe-hat-trick-as-psg-thrash-barcelona-at-camp-nou-in-pictures-1.1167561">Mbappe's brilliant treble helped Paris Saint-Germain to a 4-1 victory</a> in the first leg of their last-16 clash. The unbeaten mixed martial artist, 32, <a href="https://www.thenationalnews.com/sport/other-sport/ufc-254-tearful-khabib-nurmagomedov-says-he-is-retiring-after-victory-over-justin-gaethje-1.1098963">retired from the UFC</a> last October immediately following his successful title defence against Justin Gaethje at UFC 254 in Abu Dhabi. He has since been making the most of his time, which extended to a trip to Barcelona's iconic stadium on Tuesday. Nurmagomedov documented his visit on social media, imploring PSG to get one over Madrid’s great rivals, and at one point shared a few jokes inside the stadium with Leeds owner Andrea Radrizzani. Mbappe, meanwhile, was not the only jersey Nurmagomedov managed to acquire: he later posted a picture holding Keylor Navas’ shirt alongside the PSG goalkeeper. The Costa Rican represented Madrid from 2014-2019. Of course, Nurmagomedov is no stranger to rubbing shoulders with famous footballers. The Russian is known to be good friends with Cristiano Ronaldo, while last month he <a href="https://www.thenationalnews.com/sport/other-sport/khabib-nurmagomedov-meets-virgil-van-dijk-in-dubai-and-wishes-liverpool-defender-well-in-his-recovery-1.1156233">spent some time in Dubai</a> with Liverpool's Virgil van Dijk.