PAUL Cullen feels Ashley Klein went against RFL guidelines by allowing Hull KR's Stanley Gene to stay on the field on Sunday after a high tackle that has ruled Simon Grix out of action.

Grix impressed Cullen with his display at loose forward but suffered concussion during the tackle, causing him to fall and injure his ankle.

The injuries mean he will miss Sunday's match against the Catalans, although he could be fit to return next week at home to Wigan.

Gene has received a one-match ban for a reckless' tackle but Cullen, whose side led 28-4 when Grix went off, does not think he should have been allowed to stay on the field at the time because players are only supposed to be put on report when the officials do not have a clear view of an incident.

Cullen said: "He was charged with a reckless high tackle in the same manner that Steve Pickersgill was charged in the opening game against Hull.

"Steve stayed on the field and finished the game and so did Stanley. Steve was given a two-game ban and Stanley was given a one-game ban.

"I don't honestly know whether the officials had a clear view of the incident with Steve Pickersgill but, one thing is for certain, at the weekend they had a very clear view of the incident.

"I don't know whether the on report system was the right thing to use under those circumstances.

"It was very clear. It was an attack to the head of an opponent. The grades are accidental, careless, reckless or deliberate.

"A reckless attack to the head of an opponent doesn't warrant someone still being on the field. The player was badly injured and was forced to leave."