Hull KR coach Craig Sandercock says the Easter schedule compromises player welfare.
By the time his players leave the field against Wigan on Monday, they will have played three games in eight days.
Their televised 26-22 win over Castleford on Sunday is followed by the hotly-anticipated Hull derby on Friday.
Sandercock said: “I don’t agree with it at all. My most important job as a coach is to try and look after my players the best I can.
“We ban the shoulder charge because we’re concerned about player welfare but we let our boys play the biggest derby of the season and then back it up two days later.
“I think it’s not a great idea.
“The derby takes a big emotional and physical toll on your team and to have to back up on Monday against Wigan, one of the best sides in the competition, is a big ask.”