Real Madrid Castilla coach Zinedine Zidane is amazed by the drive of Cristiano Ronaldo.

Speaking with uefa.com, Zidane was asked about what makes Ronaldo so special.

"It's his relentless desire to make progress that surprises me. At the same time, I'm not surprised. The great thing for me is that he always wants to make progress.

"Even if Cristiano Ronaldo wins trophies and scores a lot of goals every season, his aim is always to make progress. He always wants to show, even in training, that he wants to win. It's incredible. That's what makes him stay at the top - it's his ambition to be the best."