Wests Tigers coach Tim Sheens believed Newcastle captain Andrew Johns should have been sent off for head-slamming following the Knights' 34-6 National Rugby League victory at EnergyAustralia Stadium.

Johns was one of four players put on report by referee Sean Hampstead in a spiteful match which left Newcastle fullback Robbie O'Davis with a smashed nose - the worst facial injury coach Michael Hagan had ever seen - and Tigers centre Mark O'Halloran with a heavy bout of concussion.

Hagan labelled Sheens' call "ludicrous" after Johns went on report for a head slam on O'Halloran in the 36th minute which forced the No.3 off the field.

Johns faces a nervous wait before finding out whether he can lead the Knights against Melbourne at Olympic Park next Saturday night.

Sheens said he would be surprised if NRL judiciary commissioner Jim Hall did not cite the Test, NSW and Knights skipper.

"But if you're charged and on that situation you get two weeks, why not just send him off in the first place?" asked Sheens, whose side was again committed in defence but failed miserably in execution.

"Not every incident is deserving of a send-off. If you're not sure put it on report but when you are sure, then you've got to make a decision.

"It's interesting these ones that are on report, if anyone goes for it, the referees are taking some soft options in my opinion.

"I think he should have been sent off.

"It's been coming for a while - report, report, report is still an easy option and I don't think the referees are showing courage in some respects."

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