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Cristiano Ronaldo gave Real Madrid fans cause for concern on Tuesday after leaving a pre-Champions League training session early following a collision with Kiko Casilla.
Madrid were training ahead of Saturday's San Siro showdown against city rivals Atletico - a repeat of the 2014 final which they won 4-1 extra-time.
In a media conference earlier on Tuesday, Zidane confirmed Ronaldo had sat out a practice match on Saturday as a precaution after "a little bit of a feeling in his leg".
The 31-year-old has been in superb form in this season's competition, scoring 16 goals in 11 matches as he aims to break his own record of 17 set in the club's victorious 2013-14 campaign.
