Chesterfield's goalkeeping coach has criticised the squad following their 4-0 thrashing at Sutton at the weekend
The Spireites have just one win to their name in 12 national league games so far this season.
Mark Crossley says the management team have worked tirelessly- but the players are letting them down: "Conceding schoolboy goals that you don't see at under-15 level. How can you coach that? It has to be down to the individual when he makes them mistakes.
Crossley says manager John Sheridan is frustrated with their recent form: "I've worked with loads of managers and I know he is a good manager. But he is down, he's frustrated and feels responsible.
"But he can't be totally responsible. We've protected the players a lot and now they've got to start rising to the occasion.
"We have a system called GPS. Players wear it and it tells you how hard they run. When you have a centre back covering the biggest distance and the most sprints, it means the players have got to look at themselves because they didn't work hard enough."
Tomorrow evening, Chesterfield have their chance to bounce back from Saturday's defeat when they travel to Hartlepool United.