"Cry-baby, yes, because Ronaldo already loved to win like he loves today and when he lost and when other kids didn't pass the ball to him he used to cry," Santos told Reuters.
Ronaldo's desire to win has propelled him to four domestic league titles and three Champions League trophies during his stellar career with Manchester United and Real.
The 32-year-old, who is the Champions League's all-time record goal scorer, captained the Portugal team who won last year's European Championship in France.
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(Reporting by Aditi Prakash in Bengaluru, editing by Ed Osmond)
