Barcelona midfielder Rafinha is expected to miss most of the season because of a torn ligament in his right knee.
Barcelona said Thursday that tests confirmed the ACL tear and the Brazilian is expected to undergo surgery in the next few days.
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The club did not say how long it expects the player to be sidelined, but such injuries usually require more than six months of recovery time.
Rafinha was injured just a few minutes after coming on as a substitute in the 1-1 draw against Roma in the Champions League on Wednesday.
Rafinha made his debut in the Brazilian national team in a friendly against Costa Rica earlier this month and was expected to play in South American qualifying for the World Cup in October.