Former leading referee Nigel Owens warned rugby union is in "big trouble" if Owen Farrell's dangerous tackle against Wales is no longer regarded as worthy of a sending off.
The England captain faces an independent disciplinary panel on Tuesday after World Rugby, the sport's global governing body, appealed against the decision to downgrade his red card for a high shoulder-led challenge on Taine Basham to yellow.
The original hearing's overturning of the in-game decision made by the bunker review system during England's 19-17 win over Wales at Twickenham last weekend sparked uproar throughout the global game as Farrell escaped a ban that would have threatened his involvement in next month's start of the World Cup in France.
Such a suspension is again a possibility and Wales's Owens, in charge of 100 tests from 2003 to 2020, is adamant Farrell should be punished for the tackle.
"Owen Farrell is a great player who I have a huge amount of respect for," Owens wrote in his Wales Online column published Friday.
"But he has a history of making this kind of tackle. He's been punished before and perhaps got away with a couple too.
"The referee and everybody at home watching the game would have been looking at that incident and going through their checklist.
"Do we have foul play? Yes, we do. Do we have contact with the head? Yes, we do. Do we have a high degree of danger? Yes, we certainly do. Do we have mitigation? In my view, no we don't.
"I don't think there was any late change from Basham which Farrell could not adjust to, he was the only player contributing to the action of the tackle."
World Rugby's own guidelines state there is no mitigation for "always illegal acts of foul play", with Owens saying: "The key thing about mitigation here is that Farrell's actions were always illegal.
"No matter what happened, he was always leading with the shoulder and not making an attempt to wrap for a legal tackle – so mitigation does not and should not play a part in the decision.
"This is foul play, it's an illegal charge, it's not an accident. He's always leading with the shoulder, he's made contact with the head and, sorry, he's got to take the consequences.
"Quite simply, if we don't deal with actions like this as a red card offence, then the game is going to be in big trouble moving forward."
The Six Nations, which oversees disciplinary procedures for warm-up matches involving leading European countries, said later Friday that Farrell's new hearing would be held on Tuesday.
Nigel Hampton KC, a senior lawyer from New Zealand, will chair a three-strong panel also featuring Singapore's Shao-ing Wang and Ireland's Donal Courtney.