England flanker Jack Willis could be out for a year after suffering a serious knee injury in the Six Nations victory over Italy last month.
Willis scored a try in a 41-18 win at Twickenham but was later taken off on a medical cart following lengthy treatment.
Scans showed the 24-year-old sustained ligament damage and he is now facing a long spell on the sidelines.
He said in a video on Instagram: "I've torn my MCL [medial collateral ligament] off the bone at the bottom, torn a bit off the top as well, so I am going to need that fully repaired.
"Torn both meniscus, the medial meniscus from the root one side. Pretty gutted, I could be out for up to a year."
It is another cruel blow for Willis, who missed the Red Rose's tour of South Africa in 2018 due to a knee injury.
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