The world record-breaker, who is also a huge United fan, was speaking ahead of his visit to the English, European and World champions next month.
Bolt is planning to pass on running tips to the current Premier League leaders – and to also have words with Ronaldo regarding his play-acting and "falling over."
“I’m going to tell Ronaldo to stop being such a wuss,” he said. “I’d like to see more of Wayne Rooney’s fight in Ronaldo.
“He has to be aggressive like Rooney, even if it gets him into trouble at first. He has to stop falling over all the time.
"His problem is that when he runs he leans forward and loses his balance. He needs to sprint more upright.”
Bolt has accepted an invitation from manager Sir Alex Ferguson and will meet the squad at their training ground in Carrington in mid-May. He will also watch their home clash against Arsenal on May 16.
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