West Ham midfielder James Ward-Prowse says they paid for their errors in defeat at Brentford.
The Irons lost 3-2 on the day.
It's a hard one to take," the midfielder told West Ham TV. It was a disappointing game all round.
"I think we started the game quite slowly and we conceded quite a sloppy goal. We got back into it with two really well taken goals and, when you're in that position, it's about seeing the game out.
We knew they would come again in the second half and it wasn't good enough from us, to give the game away like we did, and give away three really soft goals."