Philippe Coutinho's injury could see Liverpool lose out on £18 million.
The Brazilian was forced off with a serious knee problem in the 1-1 draw with Eibar on Tuesday and Barca would later confirm the extent of his injury.
An official Barcelona statement read: "The tests carried out on the first team player Philippe Coutinho have shown that the midfielder has an injury to the lateral meniscus in his left knee.
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"Treatment will necessitate arthroscopic surgery which will take place in the coming days."
Not only is it bad news for Barcelona, but it could also come at a cost for Liverpool, his former employers.
That's because there was a clause in the £142 million deal that took him from Anfield to the Nou Camp that stipulated Barcelona would pay Barca £18 million when Coutinho made 100 appearances for the Catalan club.
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He's currently on 90, just ten away from the century - but the serious injury means he now faces a lengthy spell on the sidelines and might not play for Barca again.
There were reports from Sport suggesting that Barca were looking to offload him in the January window before he reaches 100 appearances so they didn't have to fork out the bonus payment.
Coutinho spent last season on loan at Bayern Munich and won a historic treble, infamously scoring twice as as a substitute in the 8-2 thrashing of his parent club in the Champions League quarter finals.
Bayern decided against signing him permanently for a reported €120 million and so he returned to Barcelona, where he's made 14 appearances and scored three times under Ronald Koeman this term.
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Now out of action for months, it's looking increasingly unlikely that Liverpool will be getting their £18 million for the former Inter Milan playmaker.
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