Chesterfield manager John Sheridan fears he will be out of a job unless his players show more fight.
The Spireites were knocked out of the FA Cup by Torquay United in the first round and have won just three league games so far this season.
Sheridan told BBC Radio Sheffield: "We're in a position where we have to fight, and that's what the supporters want from us.
"If we don't show it I won't be here and the players won't be in the side."
Speaking after the defeat by the League Two side from Devon on Saturday, Sheridan was in sombre mood.
"I apologise to the fans again for the performance. We shouldn't be getting beaten against a team in a lower league than us in this competition," he said.
"I think we were good enough to win the game but we didn't show anything and that's probably the worst I've ever felt as a manager."
The former Oldham Athletic boss took over at the b2Net Stadium in the summer of 2009 and led the Spireites to the League Two championship last season.
But their fortunes have faded since promotion and they now lie third from bottom of League One in the relegation Zone.
"The amount of goals we're conceding, it's like some of the players have never played before and I've never coached a team before, so I'll take responsibility and I hope the players take responsibility as well," Sheridan continued.
"I totally understand the frustration. I don't mind people being frustrated because the way we're playing at the moment we are frustrating some people. So we take everything and we've got to stand up and be counted."