Eden Hazard was taken off in the first half of Real Madrid's match against Alaves on Saturday with an apparent injury.
The Belgian winger lasted less than 30 minutes before limping off the field as Zinedine Zidane's side would eventually fall 2-1 to the visitors.
After the game, Zidane expressed his hope that Hazard's injury wouldn't keep him out long.
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"I think and hope it's just a knock," he said at his post-game press conference. "I hope it's not muscular."
Hazard was making just his third appearance in La Liga this season as the 29-year-old's campaign has been heavily disrupted by injuries, having missed the start of the campaign due to a muscle issue.