St-Pierre had previously won his 185-pound title at UFC 217 in November wit ha third-round submission win over then-champion Michael Bisping.
"I'm not sure if I compete if I will go back at 185", said St-Pierre.
"My fight at UFC 217 was one of the greatest nights of my life", he said.
"If you're sick you're sick, but the fact is, you don't want to fight in the division", Rockhold said. It also comes shortly after it was revealed that GSP was dealing with colitis and it was unknown when he would be able to compete again.
Pierre is no longer the UFC's middleweight champion. "I don't think it's a good thing to do, to force myself to eat to gain muscle mass".
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The person spoke on the condition of anonymity because the UFC had yet to make its plans public. It would be Miocic's third defense of the title after beating Overeem and Junior Dos Santos.
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. I've always been against performance-enhancing drugs, and I did it the natural way. "I'm still welterweight size, but I chose to take a shot because I put on some muscle mass". I think the body has a natural weight it can perform at its best athletic ability.
Whittaker has held the interim championship ever since he defeated Yoel Romero, his most recent fight, with the news of St-Pierre giving up his belt elevating him to become the official undisputed champ.
But he has chose to relinquish the title after being diagnosed with ulcerative colitis, an illness that affects his ability to remain in the 185-pound middleweight class.
The Australian based Whitaker's clash with former UFC and Strikeforce champion Rockhold will take place in Perth at UFC 221 on February 11 2018. It was a more scary and stressful situation for me than the actual reality.
Whittaker (19-4), victor of The Ultimate Fighter: Smashes, initially won the interim title with a hard-fought decision over Yoel Romero in July.