Newcastle have suffered a significant NRL blow with NSW State of Origin front-rower Daniel Saifiti sidelined for up to six weeks with a knee injury.
Saifiti suffered the injury in Sunday's loss to Parramatta and scans have since confirmed ligament damage to his left posterior cruciate ligament.
At best, it's hoped the 24-year-old could return within four weeks, with his brother Jacob to start in his spot against South Sydney on Saturday.
Regardless, the injury comes as a hit to the Knights.
Saifiti has enjoyed his best year in the NRL, averaging more than 10 metres per run - the second most of all props in the NRL - and busting 20 tackles.
His combination with David Klemmer is arguably the best in the league, with big games against Melbourne, Wests Tigers and Manly in the next month.
Australian Associated Press