Wigan Athletic boss Roberto Martinez says they conceded "cheap" goals in defeat at West Ham United.
Martinez felt his men did not do themselves justice as they missed the chance to put some daylight between them and the bottom three.
"We conceded three very cheap goals for our standards, and that is something we will work on," he said.
"We had a few players missing, but that is not an excuse. You got the feeling nothing was going our way.
"There was a good opportunity to get back into the game with the penalty, and then even at the end we got a good goal ruled out.
"It is quite clear to me the things we need to work on, but I was pleased with the reaction towards the end.
"It was a day of a real test of character, and that was there, but in football you cannot concede cheap goals, otherwise you are making things very difficult.
"We just weren't ourselves today, and that is where the work is going to be."
