The UFC announced yesterday that due to “medical concerns,” heavyweight Mark Hunt (13-11-1, 1NC) has been removed from Sydney’s upcoming UFC Fight Night 121 fight with No. 8Β Marcin Tybura (16-2-0) and replaced with former world champion No. 2Β Fabricio Werdum (22-7-1).

The No. 5 “Super Samoan” took to social media to voice his displeasure over the removal with UFC president Dana White.

The decision could have something to do with an article Hunt wrote for Playersvoice.com, in which he laid out his health problems, and discussed other hot topics such as doping and fighter pay.

Werdum is coming off a 65-second submission win over Walt Harris at UFC 216 last Saturday.

Tybura, 31, is on a three-fight win streak, decisioning Andrei Arlovski in his last bout at UFC Fight Night 111 in June.

UFC Fight Night Sydney (also called UFC Fight Night 121) is scheduled for Nov. 19 (Nov. 18 in North America) at the Qudos Bank Arena in Sydney. It is the fifth UFC event for the city.

Announced bouts include:

Fabricio Werdum (22-7-1) vs. Marcin Tybura (16-2-0)

Tai Tuivasa (5-0-0) vs. Rashad Coulter (8-2-0)

Bec Rawlings (7-6-0) vs. Joanne Calderwood (11-3-0)

Elias Theodorou (13-2-0) vs. Daniel Kelly (13-2-0)

Ryan Benoit (9-5-0) vs. Ashkan Mokhtarian (13-2-0)

Alex Chambers (5-3-0) vs. Nadia Kassem (4-0-0)

More bouts are expected to be announced.

@kenaiandrews