Harlequins have confirmed that prop Will Collier will miss the rest of the season with a serious knee injury.
The 23-year-old ruptured his anterior cruciate ligament on Saturday during the team's victory over Castres in the European Rugby Champions Cup.
Despite winning 47-19 in France, Quins were eliminated from the competition at the pool stage.
Collier recently signed a contract extension with the club until 2018.
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