Penrith hooker Mitch Kenny is facing a two-game ban for a hip-drop tackle that injured Nat Butcher and incurred the wrath of Trent Robinson.

Kenny will miss clashes with Manly and Brisbane with an early plea after being given a grade-two dangerous contact charge.

The 27-year-old will also be suspended for the Panthers' round-10 match against North Queensland, should he fight the charge at the judiciary and lose.

Defending premiers Penrith, who thumped the Sydney Roosters 40-12 after a worrying 1-5 start to the season, have until Monday to make a decision.

The hip-drop tackle debate has been reignited this season, with South Sydney coach Wayne Bennett lamenting he doesn't "know what a hip-drop tackle is anymore" after Friday's loss to Canterbury.

Roosters counterpart Robinson insisted on Saturday night that "there is no confusion".

Robinson's anger was instead directed at the referee, who failed to punish the Panthers for Kenny's tackle that resulted in medial collateral ligament (MCL) damage for Butcher.

"He has got an MCL injury, it is pretty disappointing," Robinson said.

"Nothing was mentioned at all in the game, but in the tackle he gets an MCL injury and he is done for the night.

"Not to even have a discussion and a guy to do an MCL and (be) finished for the game, it is pretty clear."

Brisbane's Billy Walters (crusher tackle) and Roosters prop Naufahu Whyte (high tackle - careless) escaped with fines on Sunday.