Johnny Lomax has been ruled out for the rest of the season after he suffered a serious knee injury during Saturday’s game against Catalan.
The England ace, 23, went down during the second half after his knee buckled while attempting to return a Catalan kick.
He will now require major surgery.
Saints head coach Nathan Brown said: “This is obviously a blow to the team but more importantly to Jonny. He has been in great form and has settled well into the full back position.
“He will now begin his road to recovery led by our medical staff and we wish him well.
“Jonny has a strong character and we’re sure he will come back and prove once again to be a pivotal player for us.”