Drury has guided the Steelmen to fifth in the Blue Square North table
Corby Town manager Graham Drury says that players absent from training are risking their places in the side.
The Steelmen lost for only the fifth time in all competitions this season against Workington on Saturday.
Drury told BBC Radio Northampton: "Some players have let us down in training, crying off with feeble excuses.
"We've conceded eight goals in the last three games, that's frustrating. They'll be told if they can't make training they won't be at this club."
Corby Town host fellow Blue Square North side Alfreton Town in the FA Trophy on Saturday, but will be without strikers Jack Defty, who is cup tied, and Sam Smith, on loan from Rushden & Diamonds.
"Alfreton are a strong, direct side. I hope a big crowd will cheer us on from the kick-off," Drury added.
"We need to get a solid clean sheet behind us, and [a win] would be a fantastic result."
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