The Crusaders have suspended seven players over a breach of club discipline and none of them will face Hull Kingston Rovers on Saturday at the Racecourse.
The seven are Jason Chan, Gil Dudson, Richard Moore, Peter Lupton, Jordan Tansey, Jarrod Sammut and Lloyd White.
Crusaders chief Rod Findlay said: "The club's code of discipline was broken."
South Wales Scorpions trio Aled James, Joe Burke and Dalton Grant are on loan at the Crusaders to face Hull KR.
Chief executive Findlay went on: "The players have let the club, fans and themselves down and we have taken the appropriate action."
Findlay says the club will not reveal details of what happened, adding: "The club will be making no further comment on the matter.
"The rest of the squad and everyone involved with the club are fully focused on this Saturday's match."
Wales international James, 29 has played in Super League for Widnes and made 23 appearances for Crusaders when they were in a Championship side based in Bridgend.
James has also made six Super League appearances for the club.
Burke and Grant, both 21, also played for the club at junior level but will make their Super League debuts if selected against the Robins.
Crusaders are also without Australian second rower Hep Cahill, who is serving a one-match ban for a late tackle, but captain Clinton Schifcofske returns from a three-match absence with a rib injury.