Leeds Rhinos coach Brian McDermott was unhappy to see Danny McGuire sin-binned for reacting to a tackle that left the player with a suspected broken ankle.
Scrum-half McGuire, 32, was shown a yellow card for kicking out at Hull FC's Marc Sneyd in Sunday's 32-20 win.
Sneyd was also sent to the sin-bin and may be banned for up to five games after being charged by the RFL.
"I'm angry that our game can get it confused to such a level," McDermott said in a post-match media conference.
"The kid makes a break and has his ankle twisted - even the referee signalled that. And in desperation to not have his ankle broken, he kicks out to get the bloke off his ankle and he gets sin-binned for it.
"It worries me that the game has got that wrong."
Half-back Sneyd is facing a Grade D dangerous contact charge and could be suspended for between three and five games if found guilty at an independent hearing on Tuesday.
Hull coach Lee Radford is confident Sneyd did not intentionally try to hurt McGuire, adding: "It's obvious something's happened because I think he's sustained a serious injury.
"It was definitely a sin-binning for holding down. But if it was a crocodile roll, I don't think he's got that in his nature so if he's done it, it's probably done by accident."
Leeds also lost Liam Sutcliffe (knee) and Adam Cuthbertson (calf) to injuries, but it was the problem suffered by McGuire that McDermott believes will be most keenly felt.
"He's been single-handedly our best player all year and I'm not sure how we get over his loss," said the Rhinos coach.