Jokin Ezkieta has rejected the chance to stay at Barcelona in favour of joining Athletic Bilbao once his contract runs out.
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Barcelona's defence will be pivotal if they are to win the Champions League for the first time since 2015.
Barcelona host Manchester United with a 1-0 lead from the first leg as they look to progress to the semi-finals for the first time since 2015.
Barcelona ended their three-year winless run away from home in the Champions League with a 1-0 victory over Manchester United
Barcelona are watching Ruben Vinagre's performances for Wolves as they search the market for a long-term replacement for Jordi Alba.
Luis Suarez wants to extend his stay at Barcelona with his current contract set to run out in 2021.
The solidity that Ivan Rakitic brings to Barcelona's midfield could be key in nullifying Manchester United's counter-attacks.
Luis Suarez's opener for Barcelona against Atletico Madrid was the latest in a recent run of form from the Uruguayan.
Lionel Messi can become the all-time La Liga wins record holder with a victory over Villarreal.
Barcelona travel to Villarreal for the first game in a busy month which could see them play up to nine matches.
Barcelona have a tough run of games to start the crucial latter stages of the season.