Canberra five-eighth Jack Wighton is at long odds to play against premiers Penrith next week after his brain explosion helped hand Newcastle a 24-14 NRL win.
The Raiders No. 6 was placed on report twice by referee Gerard Sutton on Sunday but his 48th minute sin-binning proved the most costly.
Newcastle had just hit the lead – one which they never relented – when Wighton clattered the head of Knights halfback Jackson Hastings with his shoulder.