Ronaldo will not make his debut for Real Madrid in tomorrow¿s Champions League clash with Genk after suffering a slight setback in training today.
Club doctors refused to say how the Brazilian star was injured but did confirm it was not a serious incident.
Ronaldo joined Madrid from Inter Milan in August for €45 million but has been sidelined with a thigh strain.
The 26-year-old will resume training in two days and is expected to make his much anticipated debut against Real Valladolid at the weekend.