Ancelotti says "Cristiano is fully fit."
Madrid hosts Atletico on Saturday in a rematch of last season's Champions League final, when Madrid beat Atletico 4-1 in extra time.
Ronaldo's unspecified injury sidelined him for losses by both Madrid and Portugal's national team. Madrid lost at Real Sociedad 4-2 before last week's international break, when Portugal's 1-0 loss to Albania led to coach Paulo Bento stepping down.
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