Gareth Southgate has admitted Middlesbrough were simply not good enough after slumping to their second defeat in two games.
"We didn't do enough to win the game, that's for sure," he told Sky Sports. "We weren't quite positive enough until we'd gone behind really.
"We've got to pick ourselves up. Nobody's going to help us out - it's down to us."
Middlesbrough were beaten 2-1 by Blackburn in their opening game, but Southgate feels that defeat was a world apart from the showing at Wigan.
"I think they were two different games. Saturday we deserved to get something from the game - we should have won it. Tonight, we didn't deserve anything and the players know that.
"But we've got to go to Fulham and get something on Saturday."
Mido dealTottenham striker Mido was in the stands to watch the game, and Southgate is confident he will complete his move to the Riverside Stadium on Thursday.
"We're just finalising details. He's been in, he's had his medical and everything, and we're pretty confident he'll be finalised tomorrow."
Asked whether he felt it was likely striker Yakubu would remain at the club after reports he had asked to leave, he replied: "Yeah. We need everybody at the moment. We need as many experienced players as we can - we've got lots of youngsters."