Carl Hall has slammed Whitehaven’s Jessie Joe-Parker for his spear tackle on Shaun Leaf - in what turned out to be Leaf’s last ever game.
Dons chief executive Hall has described the tackle as one of the worst he has ever seen.
Leaf retired from rugby league on doctor’s advice after the game.
He had suffered a succession of head injuries this season.
Hall said: “I thought it was one of the worst tackles I’ve seen. He should have been sent off.
“Jessie Joe might be a good bloke, a good player and someone who plays hard but they’re trying to stamp that sort of thing out of the game.
“He drove Shaun’s head into the ground.
“I think he was still feeling the effects of it later in the game and he went off with concussion.”
Leaf, who made over 150 appearances for the Dons, will be granted a benefit game by the Dons later this year.
“We’re all disappointed for Shaun because he’s a stalwart of this club,” said Hall.
“He’s a tough lad and he’s been here through some really tough times. He didn’t want to finish like this.
“He wanted to go out on his terms so for it to come from doctor’s advice was tough for him to take.
“But with the things that have happened in the game recently we need to worry about Shaun’s health and his family.”
Rock bottom Doncaster suffered their 20th Championship defeat of the season at Batley last weekend.
Gary Thornton’s side welcome Hunslet Hawks to the Keepmoat Stadium on Sunday (2pm).