Tyson made a surprise visit Tuesday to a Rebels basketball practice, the Las Vegas Sun reported.
The boxing champion, who is preparing for a one-man show next month at the MGM Grand, addressed the players during a break.
"He came in and dropped some knowledge on us," sophomore forward Mike Moser said. "He got emotional thinking about not understanding how you couldn't want to be a champion."
"Guys come in and really don't put in the work but say they want something," Moser said. "I took that away, just always remembering that you've got to work hard for the goals ahead."