Leicester City head coach Marti Cifuentes spoke to BBC Radio Leicester after Saturday's 3-2 defeat by Sheffield United.
"It was below any standard, far from the standards that I want to set for the club," he said.
"It was extremely disappointing how we spoke over the last couple of days about reacting strong after what happened on Tuesday, about the importance of starting on the front foot the first 15 or 20 minutes at home, at our place, and we did just the opposite.
"It was just embarrassing to see some of the mistakes and it was below any kind of standards.