Ross County captain Andrew Davies should receive more than a two-game ban for his challenge on Celtic's Scott Brown, says ex-referee Steve Conroy.
Davies, 33, was dismissed before half-time after going in late on Brown, with County losing 3-0 on Saturday.
Unless the Scottish FA takes further action against the defender, he will serve a two-match suspension.
"I would say, 'yeah, it ranks up there. It's one of the worst I'd seen," Conroy told BBC Radio Scotland's Sportsound.
"It was certainly a nasty challenge. He had no intention of going for the ball. That's the definition of it, of violent conduct, which is what he was sent off for.
"I think it merits more than two."
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Celtic manager Brendan Rodgers described the challenge on his captain as "dangerous" and "disgraceful" and County interim co-manager Stuart Kettlewell said Davies had apologised to his team-mates.
And Conroy added: "It might be taken in mitigation that everybody's held their hands up and accepted it. Nobody's talking about appealing, everybody's saying what happened did happen. They might look leniently on it because of that."