Bradford boss Phil Parkinson was "sickened" to concede a last-gasp winner to Port Vale in their 3-2 League Two defeat.
The Bantams twice came from behind but Tom Pope headed home in the 93rd minute to hand Parkinson his first defeat since taking over at Valley Parade.
Parkinson said: "We are desperately disappointed but we've conceded a last-minute goal because we didn't put enough pressure on the ball.
"We had defended poorly in the first half when we didn't compete for the first ball, but I had a word with our back four at half-time and we had looked far more secure after the break.
"Our back lads were two or three yards off the pace in the first half, but we rectified that to a large extent in the second half so it was sickening to lose with the last kick of the game.
"I'm upset at this moment because I'm a football manager who has just lost a game, but I already know there were a lot of positives to take out of the performance. There were a lot of good things about our play, both individually and collectively."