Real Madrid's Lucas Vazquez could miss El Clasico after a freak gym accident saw him drop a weight on his foot.
The winger was doing extra gym work on Wednesday when the incident happened, sources close to the player have told ESPN FC.
The club say medical tests have confirmed Vazquez has a broken bone in the big toe of his left foot.
The recovery time is still being assessed, but sources told ESPN FC that Vazquez will be absent for between a month and six weeks.
That will see the 28-year-old unavailable for a series of games both domestic and European in one of the busiest periods in the calendar.
Real Madrid play Real Sociedad on Saturday in La Liga before hosting Paris Saint-Germain in the Champions League on Tuesday.
Those games are followed by matches with Alaves, Espanyol, Club Brugge and Valencia before the re-arranged Clasico with Barcelona on Dec. 18.
Real Madrid have suffered a string of injuries this season, with Gareth Bale only just returning to fitness having been out since October.
James Rodriguez is another recent victim, picking up a knee ligament injury on duty with Colombia during this international break.