According to a representative of the athlete's team, which reports TASS, Nurmagomedov was taken to the hospital with severe flu, fever and vomiting.
It is noted that his fight with Kazakhstani Sergey Morozov has been canceled.
UFC 254 is scheduled for October 24.
Its main event will be the title fight between lightweight champion Khabib Nurmagomedov and interim champion Justin Gaji.
Earlier it was reported that Gatji arrived in Abu Dhabi to fight Nurmagomedov.