The 23 year old suffered the injury in October but played on since to help Liverpool through a tricky spell.
He now has to go under the knife, meaning the Welshman will not return until the start of next season.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.