Georges St-Pierre has vacated the UFC middleweight title he won just over a month ago when he defeated Michael Bisping.
That comes despite UFC president Dana White's proclamation that he would be "super pissed" if GSP did not face Whittaker in a unification bout at the company's debut event in Western Australia.
The news was first tweeted by MMA Fighting's Ariel Helwani on Thursday.
So, in light of GSP's recent comments, and the confirmation he's battling colitis, one would think the UFC's likely moving ahead, and that this bout will crown a new, undisputed champ.
No formal announcement of the main event has been yet made by the promotion.
Whittaker vs Rockhold may very well be the greatest matchup you can make at 185 lbs right now so there is no doubt that this will be a fantastic fight.
"I'm not sure if I will compete if I will go back to 185", St-Pierre said in an interview.
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"I think that's f*cking ridiculous for Bisping to come back after getting knocked out two weeks before".
Many assumed that the only reason GSP chose to compete in a higher weight class was because he saw a vulnerable champion that he could beat.
For most mixed martial arts (MMA) fans, the last legitimate 185-pound title defense came when Luke Rockhold lost his title to Michael Bisping in the summer of previous year.
As a result, there are reports that a possible showdown between Rockhold and Whittaker could take place in early 2018.
A former UFC champion, Rockhold, 33, lost his title to Bisping at UFC 199 in June 2016.
The UFC have confirmed that Australian Whittaker is now officially the holder of the title, and while he has won it without a punch, it won't be long before he is forced to defend it.