Ahead of Tuesday's Johnstone Paints Trophy tie, Rosenior said: "We've got to try and find a way to get some players out and get some in.
"It's really difficult but we've got to try and do it. And we've got to continue to work with the young players.
"I've made the ultimatums to the players and I think we all know that.
"After the Rotherham game they know where they stand. And it's up to them how they respond."