Webster will miss Hull KR's games with Catalan Dragons and Castleford
Hull KR centre Jake Webster has lost his appeal against a two-game ban imposed by the Rugby Football League for dangerous contact.
Webster faces a £300 fine and will lose a £200 bond put up prior to the appeal.
The ban followed an incident during Sunday's 24-22 defeat against Warrington in which he put Chris Riley at an unacceptable risk of injury.
Wakefield hooker Julien Rinaldi was fined £500 for a dangerous tackle on Catalan Dragons prop David Ferriol.
The hearing found the French international guilty of a tackle which placed undue pressure on Ferriol's shoulder during the Wildcats' 38-14 victory over the Dragons in Perpignan on Saturday.