Barcelona left-back Jordi Alba has been ruled out for up to three weeks after suffering a torn hamstring in the 3-2 win over Sevilla on Saturday.
A club statement read: "The medical services have confirmed that the player suffered a muscle tear in his right femoral biceps (hamstring). The estimated time out is three weeks."
The Spain international had to be replaced by Adriano after just 14 minutes of the clash against Sevilla, and will almost certainly now miss Barça's opening two UEFA Champions League games against Ajax and Celtic.
The injury comes at the worst possible time for the Catalans' coach Gerardo Martino, with the injury-prone Adriano the only cover on offer at left back.
Barcelona face a punishing schedule in the next few weeks with six games in the next 20 days, and Alba is also now a doubt for Spain's two remaining 2014 FIFA World Cup Brazil™ qualifiers against Belarus and Georgia next month.