UFC officials today announced that Mark Hunt will no longer compete in the promotions’s return to Australia.

Citing “medical concerns,” Hunt (13-11-1 MMA, 8-5-1 UFC) has been pulled from a planned headlining matchup with Marcin Tybura (16-2 MMA, 3-1 UFC) at November’s UFC Fight Night 121 event at Sydney’s Qudos Bank Arena. Fresh off a win at this past weekend’s UFC 216, Fabricio Werdum (22-7-1 MMA, 10-4 UFC) replaces Hunt in the night’s main event.

Hunt recently penned a piece for PlayersVoice.com.au entitled “If I die fighting, that’s fine,” in which he admitted trouble sleeping and said he’s begin to stutter and slur his words. That prompted UFC officials to pull the 43-year-old slugger from the card.

“Following a recent first-person article published by UFC heavyweight Mark Hunt, UFC has taken the precautionary steps of removing Hunt from a previously announced bout in Sydney, Australia,” a statement first issued to News.com.au read. “The health-related statements made by Hunt in the article represent the first time UFC was made aware of these claims. Athlete health and safety is of the utmost importance to the organization and it would never knowingly schedule an athlete complaining of health issues for a fight. The organization will require that Hunt undergo further testing and evaluations prior to competing in any future UFC bout.”

Hunt immediately took to social media to voice his displeasure with the promotion’s decision.

https://www.instagram.com/p/BaFfEoCgaaH/?hl=en&taken-by=markhuntfighter

Werdum, who picked up a 65-second win over Walt Harris in a hastily arranged bout at this past weekend’s UFC 216 event, is currently ranked No. 3 in the latest USA TODAY Sports/MMAjunkie MMA heavyweight rankings.

For more on UFC Fight Night 121, check out the UFC Rumors section of the site.