Sylvester Stallone says he's Team McGregor all the way -- telling TMZ Sports he believes Conor has a real shot against Floyd Mayweather.
"Then again, I live my life in fantasy," Stallone joked.
Sly is a huge boxing fan -- but he's also one of the celebrity minority owners of the UFC. So, he's kinda got a dog in this fight ... the underdog.
"I always have the underdog."
Conor and Floyd are set to fight at the T-Mobile Arena in Vegas on August 26 -- but Stallone says he's already made up his mind about going to the fight.
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