Scans have shown he sustained an Achilles problem on the final day of the Premier League season.
The Spanish midfielder underwent a scan on Monday which eased fears that he suffered significant damage during Sunday's 3-1 win over Wolverhampton Wanderers at Anfield.
However, it remains unclear at this stage whether he will be fit for Saturday's showdown against Real Madrid in Paris.
The 31-year-old, who came off at half-time on Sunday, has already missed one final this season after being hurt in the warm-up before the Carabao Cup clash with Chelsea.
The Reds also face a second injury concern in midfield with Fabinho out since the 2-1 win at Aston Villa but the Brazilian is hoping to train later this week.
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