Atletico Madrid have confirmed a scan has diagnosed defender Jose Gimenez with a hamstring injury.
The centre-back had to be substituted in Atletico's 3-1 defeat of Club Brugge in the Champions League on Wednesday.
Gimenez had been a doubt for last weekend's El Derbi against Real Madrid but was passed to play the game, which ended goalless.
But the 23-year-old could have a spell on the sidelines after tests confirmed he has a hamstring injury.
Atletico have offered no timescale for Gimenez's recovery, with the defender likely to miss Sunday's league game at home to Real Betis.
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