Gareth Bale trained indoors on Friday with Real Madrid and is a doubt for the Spanish Primera Division match on Sunday against Espanyol after injuring his hip during the club's 2-1 Champions League group stage win on Wednesday over Sporting.
Forward Cristiano Ronaldo was also missing at Valdebebas training on Friday, although the club report also said he also trained indoors.
The Champions League title defenders returned to training one day after hosting Sporting at the Bernabeu.
Real Madrid are looking to maintain their perfect start to the season and set a club record of 16 consecutive La Liga wins on Sunday.
They are three points clear of rivals Barcelona, who are playing catch-up following their defeat to Alaves.
Fabio Coentrao returned to complete training on Friday and was passed fit to play on Sunday and is available for coach Zinedine Zidane.