"I'm listening to my doctors," he wrote via text message, "and I'm not putting extra pressure on myself by giving any timeline because it's not possible to do so as of now. Everything associated with recovery/rehab is on track 100 percent."
"I'm out of the equation until I'm cleared by the doctor," he wrote. "Barao is the champion for now, and my belt/title defenses up to this point save me a spot to fight the interim champion when I am healed.
"The UFC is a machine, and machines never stop. It's out of my hands at this point.
"And yes, needless to say, this sucks for me."
Barao vs. Wineland will take place June 15 at the MTS Centre in Winnipeg, Manitoba, Canada.