Hull KRprop Jonny Walker has been banned for one game for making dangerous contact with Widnes prop Ben Kavanagh.
Faced with missing either one or two matches, Walker entered an early guilty plea to minimise the punishment.
He will now miss Saturday's trip to Salford Red Devils.
Walker made his return from a lengthy injury lay-off in the 34-29 defeat at the KC Lightstream Stadium as replacement for the injured Justin Poore.
His place may now go to James Green who signed a new deal to stay at Rovers until the end of the 2016 season.
Others in contention to replace Walker are Rhys Lovegrove and Jason Netherton.
