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Daryl McMahon admitted Ebbsfleet didn't work hard enough in their FA Trophy tie against Warrington Town on Saturday.
The Yellows play two divisions below Fleet in the Evo-Stik Premier but they deserved to go through after scoring seven minutes from time.
Only a stoppage-time strike from Sean Shields saved Ebbsfleet's blushes and they now face a replay in the north-west on Tuesday night.
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McMahon said: "They out-worked us, you can't put anything else on it. I'm sure Cards (Warrington manager Paul Carden), who I know really well, would probably take all 11 of my players over his but we just haven't worked enough, simple as that.
"When you cross the white line, the one thing you can't give footballers is desire. They had more desire than we had today and that disappoints me massively.
"You need to work hard in every game of football. If you don't run around, you can't win games of football and I don't think we worked hard enough. That's from the first minute and then you're always playing catch-up and the frustration creeps in, around the ground, the players with each other, which is natural when you don't start well.
"We weren't anywhere near the level we expect. We lacked any real tempo and urgency, we never really got going and it was littered with massively uncharacteristic technical ability from us in the sense of going under people's feet, miscontrolling it, over-running it, there was a lot of bad decision-making and it was disjointed but we got out of jail at the end with Shieldsy's goal."
The performance was in total contrast to Fleet's midweek win at Maidstone.
McMahon said: "You don't expect to go from that level to this but that's where we're at. When people keep asking me about the play-offs, we've got very little chance of getting in there when you see we can't build on performances enough. We go high and low too much and we don't make good decisions when we're not playing well.
"We'd spoken yesterday and today about making sure started well. That first hour was important but we went totally the other way.
"In your mind you think 'we'll get a goal in a minute, Shields will do something, Weston will do something or Coulson will do something' and then you start becoming bitty and disjointed and they're at you, they're getting around you and it leads to more frustration.
"Off the back of that, there were lots of bad decisions instead of us rolling our sleeves up and doing what we had to to dig it out. We tried to over-football it sometimes in the wrong areas or when it wasn't really needed.
"Because it's against a side from a lower level, sometimes it's hard to get yourself going. If that was a National League game and we started not so good, we'd immediately switch into gear but it was lethargic.
"I thought the players looked tired as well. We've had a difficult run of games and we have been, across the Christmas period, down to the bare bones."