Real Madrid captain Sergio Ramos could miss both legs of the looming Champions League quarter-final against Liverpool and a league clash with Barcelona due after sustaining a calf injury and.
Ramos was an 86th-minute substitute in Spain's 3-1 win over Kosovo in a World Cup qualifier on Wednesday.
The problem puts his participation in Tuesday's Champions League quarter-final first leg at home to Jurgen Klopp's men and the Clasico with visitors Barca on 10 April in serious doubt.
"After undergoing tests, our captain Sergio Ramos has been diagnosed with an inner calf injury in his left leg," a club statement read.
The 35-year-old Ramos, who is out of contract at the end of the season, had knee surgery on a torn meniscus in January, missing 10 games, and made his comeback in last month's 3-1 Champions League last-16 second-leg victory over Atalanta.
The club did not say how long this new problem will keep him out for but media reports suggest it will be up to a month.
