"We probably came here at the wrong time on the back of seven straight victories for United," Wigley said after the game at Old Trafford.
"We knew it would be difficult but felt if we applied ourselves like we did against Arsenal we might have got something.
"We did our job in the first half, but gave away a poor goal earlier in the second when we had one or two opportunities to clear.
"There was a lack of concentration and after the goal the belief drained out of the players."