Wigan Coach Shaun Wane was "gutted" by his teams performance in the Challenge Cup loss to Leeds on Saturday.
"The bad start didn't help but we made too many errors throughout the game," he said.
"A few in the first half were uncharacteristic.
"I said before the game the team that completes best would win and that's what happened.
"It was our worst performance. We didn't turn up today. We've defended all year better than that.
"But take nothing way from Leeds. They wanted it more which to me is gutting. They've some real warriors in their team."
The Warriors are still top of Super League and Wane says his team will use their Cup exit as extra motivation to reach Old Trafford.
"We've just spoken about that in the dressing room," he said.
"There are two ways of responding.
"I'm gutted but we won't sulk and I'm expecting real change in attitude at London next week."