Barcelona says left back Jordi Alba will be sidelined for around three weeks after tearing a muscle in his right leg.

Alba was substituted early in Saturday's Spanish league match, a 3-2 win over Sevilla .

The injury will rule Alba out of Barcelona's Champions League opener at home against Ajax on Wednesday and its second group phase match at Celtic on Oct. 1.

Alba, a Spain international, scored the first goal in a 2-0 win over Finland in a World Cup qualifier last week.