Catalan Dragons' Julian Bousquet has failed to have his four-match ban reduced while team-mate Brent Webb and Warrington's Ben Westwood have been handed one-match suspensions.
The 21-year-old France international was given the suspension a week ago for a shoulder charge that knocked out Salford scrum-half Theo Fages and he sat out last Friday's defeat to the Wolves.
Bousquet admitted the offence when he appeared via Skype in front of the Rugby Football League's disciplinary committee but the Catalans contested the severity of the ban.
The club risked having the ban increased but the RFL's appeal panel on Tuesday night ruled the original punishment should stand.
The Dragons' disciplinary worries worsened when former Leeds Rhinos full-back Brent Webb was given a one-match ban after being found guilty of fighting.
The ex-New Zealand international was sin-binned, along with Warrington forward Westwood, during his side's 24-16 loss on Friday.
Webb will miss his side's game at Castleford on Sunday but stand-off Leon Pryce will be available after he admitted a grade A charge of kicking out in the tackle.
Pryce avoided a ban but forfeited his right to submit another early-guilty plea for 12 months.
Like Webb, Westwood was given a one-match ban, ruling him out of Warrington's trip to Hull FC on Saturday.
Meanwhile, Bradford Bulls' Nick Scruton has been cleared to face St Helens after landing a £300 fine after being found guilty of a reckless high tackle on Castleford's Gareth O'Brien.
The Disciplinary panel listened to the argument and felt that tackle was not serious enough to warrant a Grade B charge and downgraded the offence to Grade A. They then imposed a fine but no suspension.
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