Atletico Madrid have confirmed captain Diego Godin has been sidelined by a thigh problem, the centre-back adding to the injury problems for the La Liga title hopefuls.
Godin forced off at half-time of Atletico's 2-0 home win against Getafe on Saturday.
Atleti host Juventus in the first leg of their Champions League last-16 tie on February 20 and it is unclear whether Godin will be available.
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"Our captain has undergone an MRI at the Clinica Universidad de Navarra and the results offered by the medical services of the club indicates that he suffers an elongation in the adductor muscle of the right thigh and remains pending evolution," a club statement said.