Brentford boss Uwe Rosler took full responsibility for his side's disappointing 3-1 home defeat to Yeovil.
The German blamed a double substitution when he threw on debutant striker Paul Hayes and attacking midfielder Harry Forrester for the setback.
"It was too offensive too early and I take the blame for that. It was too much too soon and we paid the price," the Bees boss said.
The outcome was that Brentford were booed off in their first home start of the season thanks to a brace from Yeovil striker James Hayter and Tony Craig's own goal.
Gary Johnson's side were excellent value for the win as they tore the home side's defence apart through Hayter's guile and the pace of Reuben Reid.
Bees substitute Paul Hayes missed a golden chance to give Brentford the lead from the penalty spot with his first touch, but Yeovil goalkeeper Marek Stech saved to spare centre-back Byron Webster's blushes after he had inexplicably handled in the box.
Yeovil boss Johnson said: "We knew pace would be the key and we have it in abundance. We didn't fill the bench with subs, but it's quality not quantity.
"It's a good win here because Brentford are looking to be one of the sides up there at the end of the season so to come and finish so clinically was superb - that's what you get from James Hayter."
Johnson added: "I think the penalty save was the turning point, but we showed great resilience throughout and real composure at the end to pick our counter-attacks."