Petr Cech rapped his Arsenal teammates after their frustrating draw at Southampton.
The goalkeeper insists they didn't deserve victory at St Mary's.
"We deserved to get a point for the second half performance," he said.
"We put them under pressure and created more than in the first half. We don't deserve all three because we gave them good chances in the start and could have been 3-0 down.
"The first 10 minutes cost us the game against Man United. And it almost did again today. It is something we have to work on. 1-1 is a fair result.
"Every player needs to ensure that when they step out of the dressing room they are ready to compete."