Cambridge United manager Jez George believes it's time to reassess all aspects of the club after the disappointing 2-1 defeat to Ryman League side Wealdstone in the FA Trophy.
George admitted after the clash the U's have "lost their way" and that changes need to be made, even if it means replacing himself.
He told Cambridge News: "'Not good enough' sums it up. For that I take responsibility because I'm the manager, I signed the players and selected them, so the buck stops with me.
"I take responsibility that our supporters go home embarrassed by a team two leagues lower than us and, full credit to Wealdstone, they conducted themselves impeccably.
"We have to take a long, hard look at ourselves in the mirror - there are things I've said in the dressing room that will remain in there. Things that need to be done will be - and you'll see it being done - but it's best left like that.
"Some might be short-term, some long-term because, in football, players are protected with contracts whereas in most walks of life if you don't do your job, you pay the consequences.
"We're employed by this club to win matches and perform for our fans. We've not done it very well for the last few weeks, so I've got to look at myself and the players have got to look at themselves.
"Earlier in the season the progress was immense, but we've dropped off that and we've got to find out the problem.
"If it's me, I'll find someone else to do the job because that's not an issue - the most important thing is the club. If it's players, we need to replace them. If it's a mindset and ethic, that's something we'll have to deal with.
"The first thing we need is honesty. It's very easy as a manager to jolly people along and cajole performances out of them, but I don't think I should be cajoling people to run.
"Some of the players have to realise we're in the bottom league of professional football in this country and there are teams above us who are part-time. So we've all got to look at that and say we need to be better."