Aston Villa boss Tim Sherwood said he has "never felt this bad" after his side threw away a 2-0 lead to lose 3-2 at Leicester on Sunday.
The Villans looked to be heading for the second league win of the season until three second-half goals from the hosts moved Leicester second.
"I'm gutted for everyone who's associated with the club. We have to stop letting in soft goals," Sherwood told the BBC.
"Who cares if we played well? We lost."
'We must stop the errors'
A goal in each half from Jack Grealish and Carles Gil put Sherwood's men in control until they were stunned by three goals in the final 20 minutes.
Ritchie de Laet volleyed a goal back before a strike from Jamie Vardy and a late header from debutant Nathan Dyer earned Leicester the points.
"There was a lot of bad play there in the last half hour," said Sherwood.
"The only way you can stop the momentum is to stop the opposition. We turned it over stupidly. What can I say?
"The players are as disappointed as I am. They are a good group. We just have to stop the errors - sooner rather than later. We've got two big derbies coming up so we'll make sure we are right for them. We played some good stuff but we've come away with nothing."
'It's all about safety'
The Foxes' stirring second-half comeback lifted them to second in the Premier League as their unbeaten run remains intact.
They haven't lost in the league for nine matches, stretching back to last season, and - since 4 April - are the joint form team in the top flight with Manchester City.
"It's fantastic. We showed spirit and good character," said Leicester manager Claudio Ranieri, who succeeded the sacked Nigel Pearson in July. "After 2-0 I watched my players and they believed everything was possible.
"I told the players we have 11 points and we still need 29. I don't know when to achieve these points, but as soon as possible. At the moment we want to think only about the safety of the team."