Whittaker's new opponent, Rockhold, is coming off a second-round TKO win of David Branch at UFC Fight Night 116 in September.
"I did what I did; I learned from my mistakes", said St-Pierre, who seems to attribute a recent bout of colitis to his calorific pre-UFC 217 diet.
Reports have suggested that the Canadian legend's contract for his title shot against Bisping included a clause for an immediate defence against interim middleweight champion Robert Whittaker, who's been linked to an imminent clash with former title-holder Luke Rockhold.
Robert Whittaker has become the first Australian UFC champion in unusual circumstances, awarded the UFC middleweight championship today after Georges St-Pierre vacated the title.
As for St-Pierre, if he does return to the Octagon, it will likely be at his previous fighting weight of 170 pounds, where he was champion for six years before taking a hiatus from the sport after his decision victory over Johny Hendricks in 2013.
UFC 221, the first UFC event in Western Australia, takes place at the Perth Arena on February 11.
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"We'll talk about it, but I'm not sure if I compete I will go back at 185".
"Of course in terms of weight, if I want to go back to compete at 185, obviously eating like I did what I did, I learned from my mistakes".
St-Pierre's 34 days as champion is the shortest title reign in UFC history. In light of the GSP news, the UFC removed the interim tag from Whittaker and promoted him as the undisputed champion.
"I will be giving up my belt and once I'm healthy I look forward to working with the UFC to determine what's next in my career".
Whittaker (19-4) now faces a very-beatable Rockhold (16-3) in what is expected to be the main event at UFC 221.