Canseco, 47, whose baseball comeback bid with the Quintana Roo Tigres of the Mexican League stalled last week when he was banned for declining to take a doping test, has been calling out the four-time NBA champion in messages on his Twitter account.
"I challenged him a long time ago. If he wants it done, he knows where to find me," O'Neal, who was listed at 7-foot-1 and 325 pounds in his playing career, told Reuters on Tuesday..
"He can be high off whatever, and I'll be high off Frosted Flakes," O'Neal, 40, said.
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