Real Madrid's Welsh forward Gareth Bale (C) controls the ball during the UEFA Champions League football match Sporting CP vs Real Madrid CF at the Jose Alvalade stadium in Lisbon on November 22, 2016.
PHOTO: AFP
Bale has been in supreme form in recent weeks having tied his future to the European champions with a bumper contract extension to 2022.
Bale turns back on Premier League with mega Real Madrid deal
"I don't know at the moment [the extent of the injury], it is his ankle and we'll see. At the moment it doesn't look good, but I can't say any more," Madrid boss told Spanish TV station Mega.
Victory in the Portuguese capital assured Madrid's place in the last 16 for a record 20th consecutive season, but Real need to beat Borussia Dortmund at home in two weeks to be assured of top spot in Group F.
Bale extends Real Madrid contract till 2022
As well as blockbuster clashes with Barca and Dortmund, Madrid also travel to Japan for the Club World Cup in a demanding December.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ