Sheffield United boss Chris Wilder says they paid for their errors after a 4-1 defeat against Chelsea.
David McGoldrick gave the Blades the lead in the ninth minute with a deft flick from close range.
But Tammy Abraham's scuffed half-volley bounced past Aaron Ramsdale for Chelsea's equaliser, before Ben Chilwell touched in Hakim Ziyech's cross at the back post.
Ziyech turned provider again after the break when Thiago Silva headed in his free-kick at the near post, before Timo Werner added a fourth.
Wilder said, "At times my teams are naive. It's irrelevant. We have given away some poor goals. I think we have to look at ourselves.
"If you give handouts to world-class players they will take their opportunities - which they did. It's no good opening up then as it could be any score."
