Luckless Newcastle Knights backrower Robbie Rochow faces an anxious wait on scans after breaking his arm for the second time in a year.

The off-contract Rochow, who is reportedly in negotiations with a number of NRL clubs, including the Knights, fractured his right arm in a contact session on Thursday.

It is yet to be determined how long he will be out for the Knights, who have yet to win a game this season.

The injury is just another major blow for coach Nathan Brown, who was looking to play the 25-year-old in the centres against Wests Tigers on Sunday should Sione Mata’utia fail to overcome a concussion test.

“He (Rochow) would have been an option for us in the centres along with Jaelen Feeney if Sione didn’t come up,” Brown told News Corp Australia.

“At this stage, I’m still not sure what the team is going to look like.”

Rochow’s 2015 season ended after breaking the same arm against Brisbane in round 16, in what was just his second game since returning from a back problem. He played just five games for the season.

His absence is just the latest in what is now a bulging casualty ward for coach Nathan Brown.

Prop Kade Snowden, who hasn’t played since round one, remains out indefinitely as he continues to battle a back problem that threatens to derail his season.

The Knights could make a number of changes from the side named by Brown on Tuesday, with Nathan Ross (elbow), Jake Mamo (ankle), Danny Levi (back) and Mata’utia all facing late fitness tests.

Jacob Saifiti is likely to be re-inserted into the starting line-up against the Tigers, with twin brother David a chance to take his place on the bench.

The game also marks the season debut of co-captain Tariq Sims after completing a five-match suspension.