Paul Cooke says he will not stand for basic individual errors and has warned the Dons’ biggest offenders that their starting place is on the line.
Doncaster kick off the new Championship season on Sunday at London Broncos.
After a hit and miss pre-season campaign, Cooke says he will not be afraid to be ruthless in his team selection this weekend.
He said: “Some players are going to be really disappointed because they feel that they should be in there, but we are going to pick a team based on what we have seen over the past four weeks.
“The players are aware, the players aren’t stupid.
“They don’t need telling by the staff that the first 15 minutes of the second half against Leeds wasn’t good enough.
“They don’t need telling that our play one areas are not good enough and they don’t need telling that when we have the ball and we give a penalty away, it’s a cardinal sin.
“The players who have these issues either address them or they don’t play, it’s that simple.
“We can’t keep beating around the bush with players and wrapping them in cotton wool when they are still making the same mistakes.”