Mason Lino appears to have picked up a knee injury.
The halfback limped from the field in the Knights' 20-4 Canterbury Cup NSW loss to Penrith on Saturday.
Lino came off second best in the act of making a try saving tackle.
It's a blow for the little No.7 who was making his return from an injury he picked up in the Cronulla trial match a few weeks back.
The extent of the injury is yet to be determined.
It's a blow for the team who only managed to score one try against the 2018 minor premiers.
Tex Hoy was the sole try scorer, crossing on the back of his blistering speed.
Next Saturday, the Knights travel to Aubrey Keech Reserve to take on Mounties.