He was taken to a nearby hospital after the loss -- the first of his 7-year boxing career -- and was put into a medically-induced coma following surgery on a subdural hematoma.
Morrell went to Twitter after the sad update on Yerbossynuly's condition ... saying even though he got the win, he's focusing on Aidos' recovery.
"It is a great moment for me but at the same time super hard for others," Morrell said.
"Let's pray for a super fast recovery and ponta for Aidos," he added. "God bless you and be with you."
Other boxers sent Aidos well wishes as well ... including Muhammad Ali's boxing grandson Nico Ali Walsh who wrote, "Please send many prayers to my Muslim brother Aidos Yerbossynuly for a speedy recovery."
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A Premier Boxing Champions spokesperson said they are working with Aidos' team and TGB Promotions to monitor Yerbossynuly's situation.
"Out of respect for he and his family's privacy, we can't share any details but we ask the boxing community to keep him in your thoughts and prayers."