Boreham Wood boss Luke Garrard has questioned his team's commitment after Monday's FA Cup first-round replay loss to eighth-tier Northwich Victoria.
The 30-year-old, who is the youngest manager in England's top five divisions, saw his side knocked out by the lowest-ranked team left in the cup.
"I have to question the hunger to want to win a tackle and a header," he told BBC Three Counties Radio.
"That's the first time I have done that."
Garrard, who has led the National League side since 14 October, added: "I have always said previously that the boys' commitment, desire and hunger was never in question.
"Maybe (there has been) a lack of quality at times - but today I question both.
"You can't install desire and hunger into a player - Northwich Victoria have got it in abundance."
After their surprise victory, Northwich - whose boss Jim Gannon believes they can play at a higher level - will now travel to League Two side Northampton on 5 December in round two.