Wales flanker Ellis Jenkins is set to undergo a surgery following the knee injury that he sustained during the 20-11 win over South Africa in the final week of the autumn internationals.
The 25-year-old was a late change promoted from the bench to the starting line-up after Dan Lydiate withdrew through injury and played a pivotal role in his side's win as Warren Gatland's men completed a successful November series campaign where they also defeated Scotland, Australia and Tonga previously.
The news was confirmed by a statement released by his club Cardiff Blues.
"Cardiff Blues can confirm Ellis Jenkins sustained a significant knee injury during Wales' autumn victory over South Africa, which will require surgical intervention," read a statement on their official website.
"Further specialist reviews are needed to establish an accurate prognosis following surgery.
"Cardiff Blues and WRU [Welsh Rugby Union] have and will continue to work closely to manage Ellis's care optimally. No further comments will be made at this stage."
Jenkins has played 11 Tests for Wales since his debut in 2016 and most recently captained the side against Tonga which they went on to win 74-24.