Rockhold, on the other hand, surrendered his title in shocking fashion to Bisping at UFC 199 in June 2016.
"We'll talk about it, but I'm not sure if I compete I will go back at 185", St-Pierre said.
Prior to the event, UFC President Dana White insisted that St-Pierre would defend his title if he defeated Bisping and, after the 36-year-old did exactly that at UFC 217, White stated that he would be "super pissed" if the fighter reneged on his contractual agreement.
The Canadian wound up winning the fight after hitting Bisping with a hellacious hook that dropped the Englishman, before subsequently locking in a rear-naked choke that would render Bisping unconscious.
Bisping lost his Ultimate Fighting Championship (UFC) middleweight title to Georges St-Pierre on November 4 via submission.
Recently St-Pierre announced that he is dealing with an illness and will be out indefinitely. GSP is battling ulcerative colitis anyway so prior to his recent interview it was expected that the Interim champion, Robert Whittaker would indeed defend his title before challenging for GSP's anyway.More news: Breath of the Wild DLC Available Tonight!
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St Pierre, the former welterweight king, returned to the sport last month with a stunning win over former middleweight champ Michael Bisping in NY.
Numerous media outlets report the news on Thursday, with the reference on Ariel Helwani.
Whittaker (19-4), who was hoping to face GSP in a title unification bout, has been elevated from interim champion to undisputed champion.
Rockhold is well established at the top of the division as one of its most skilled strikers and submission grapplers.
Earlier this week, Luke Rockhold called Whittaker "the real champ" and said he was "ready to fight him". The 36-year-old is now suffering from colitis, and said he did not wish to hold up the UFC's 185-pound division. And who do you think would emerge victorious in the potential match-up?