Barcelona look set to be without full-back Dani Alves for a spell due to a groin strain, although Sergio Busquets' ankle problem has been confirmed as nothing serious.
Alves was forced off early in Barca's 1-0 victory over Athletic Bilbao on Sunday, while midfielder Busquets was replaced in the second half after a collision with striker Aritz Aduriz.
The withdrawals somewhat soured Barca's opening-day victory and Alves now faces time on the sidelines after receiving the results of medical tests on Monday.
A Barca statement confirmed the Brazilian suffered a groin strain, but described Busquets' knock as "nothing important".
Luis Suarez provided the winner for Luis Enrique's side - the striker getting the champions' title defence up and running at San Mames after Lionel Messi had a penalty saved.
‘It was without a doubt one of the most important matches that I played in my career. It wasn’t just Champions League football – it was a whole club at stake’: Ex-Chelsea star opens up on key game which changed the Blues' fortunes forever
'I was Arsenal captain and really enjoyed it, but when Man City come calling, you have to listen': England international reveals reason for swapping London with Manchester
