After ending their winless run of eight games, Rosler believes that his players should be proud of their triumph over the league leaders.
"Before the game, nobody gave us a chance but this was the best away performance since I have been at the club," the German is quoted as saying by BBC Sport.
"We had complete dedication to the game plan, demonstrating that we are not a group of individuals but that we are starting to come together and be a team. I am so proud as to how they reacted as a group and I think the players have answered the questions in a very impressive way."
The result has seen Wigan move up to 19th place in the table, four points clear of the relegation zone.