Chesterfield boss Lee Richardson has warned his side to tighten up in defence in a bid to kick-start their League Two campaign.
The Spireites have taken only nine points from eight league games this season and Richardson has been unimpressed by his players' application at the back, especially early on in games.
He told the Sheffield Star: "It's thoroughly depressing for all of us.
"We talk about it, work on it and talk about it again and still we seem to be fragile and on the back foot for the first 15 minutes of games.
"It's almost like we need to be stung into life. We've looked at game preparation but it's not that, it's players not doing their jobs.
"I'm not going to let the players hide behind me because at times players just don't do their jobs. And when you don't do your job, you get punished."