Rangi Chase has been banned for two matches after being found guilty of a reckless challenge during his side's Super League clash against reigning champions Leeds at the weekend.
The Castleford star was charged over the tackle that knocked out Zak Hardaker and he was also fined £300 by the RFL's disciplinary committee.
He will miss the Tigers' match at Bradford this Saturday as well as their home game against Catalan Dragons on Sunday week.
Also at Tuesday's hearing, Catalan Dragons prop Julian Bousquet was banned for four matches for the challenge that put Salford's French scrum-half Theo Fages in hospital.
Bousquet, 22, who was making only his fourth appearance in Super League, was sent off just three minutes into his side's 40-6 win over the City Reds in Perpignan on Saturday.
Bousquet, who made his debut for France against England in the final of the autumn international series in November, was also fined £300 after being found guilty of intentionally striking with his shoulder.
Fages, 18, who made his Super League debut against Wigan a week earlier, was knocked unconscious by the tackle and the game was held up for eight minutes as he received treatment on the pitch.
He was released from hospital later that night but was not cleared to fly and is still in France recovering at his family home.
He is now due to return to Manchester on Thursday and is expected to be out for two weeks.
Widnes prop Ben Cross, who was sent off for a late tackle in his side's 16-4 defeat by St Helens on Sunday, pleaded guilty to a late tackle on St Helens captain Paul Wellens and was given a one-match ban.