Stefan Savic has undergone surgery on his hip, but Atletico Madrid say the defender will return in time for pre-season.
Centre-back Savic made 27 LaLiga appearances last season but also required treatment on a hernia.
"Due to this reason, the Montenegro international was out of the friendly match in Nigeria that was played on Tuesday," Atletico said in a statement.
"The club's doctors have confidence on his complete recovery for the start of the pre-season."
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