Dylan Lucas has been diagnosed with multiple cartilage fractures in his throat and will join Tyson Frizell in Newcastle's busy casualty ward.
In better news for the depleted Knights, marquee man Dylan Brown will be named to return from his knee injury for their game with the Sydney Roosters.
Second-rower Lucas will be sidelined for between four and six weeks after suffering his nasty injury in Sunday's 42-22 loss to fellow improvers Wests Tigers.
Lucas remained in Campbelltown Hospital after the round-six clash but is expected to be discharged and return to Newcastle on Tuesday afternoon.
It comes as inspirational veteran Frizell prepares to miss three to four weeks with the rib injury he suffered against the Tigers.
Frizell had been in great form under new coach Justin Holbrook, running for 166 metres off the bench in the Knights' round-five win over Canberra.
The two important forwards will join star fullback Kalyn Ponga and centre Bradman Best on the sidelines for Sunday's clash in Sydney against the Roosters.
Brown has been absent since the round-two defeat of Manly and is set to return on time, with Ponga (hamstring) and Best (groin) expected back in round 10.
