UWE Rosler believes his side would have beaten NK Maribor were it not for Chris McCann’s farcical sending off in the first half.
The Irishman was dismissed after picking up a second yellow card for a handball that led to a penalty from which the Slovenians equalised.
Throughout the game, the referee was quick to blow his whistle with Rosler saying he looked “inexperienced”.
A victory would have sent Wigan through to the next round of the competition, instead a defeat means they finish bottom of Group D.
“My team deserve better from the referee,” said Rosler. “It was a deflected ball that lead to a penalty.
“He shot from a very close distance, hit his thigh. It was not a penalty and never a sending off.
“I did not have a good feeling before the game started, I did not like the look of him. He looked very inexperienced, he influenced the game in a traumatic way.
“With no sending off we would have won the game.”
It was one of Wigan’s strongest performances of late but it was also one which resulted in their sixth consecutive defeat in all competitions.
Rosler believes there is enough to take from the game though to turn things around against Bolton on Sunday.
“We controlled the game after the red card as well,” he added. “I’m very happy the way we performed, we totally dominated . My team did exactly what we wanted to do. We totally dominated that game and they never looked liked scoring goals.
“I’m very proud of my players. We attacked early on and we were getting the ball forward late on.
“Everybody in the stadium will be proud of the team and with no sending off we would have won the game, I don’t think it will be difficult to lift them.”
Rosler was also delighted with the way the 1,000 plus Wigan fans got behind their team.
“It is a big lift to hear the fans chanting my name,” he said. “We will not leave Maribor with our heads down.
“The fans were terrific in terms of numbers and in terms of the noise they made.
“They supported their team throughout the 90 minutes. They saw the team didn’t play as individuals they played as a team
“We had a gameplan and we pushed for it.”