The Latics boss put out a line up of first team players for the tie and despite going ahead Rosler's team ended the game on the wrong end of a 2-1 scoreline.
Speaking to the press after the game Rosler said: "We felt we had enough strength in depth and we looked like we would be on a winning streak after about 10 or 15 minutes because we completely took over.
"We got our goal and, at that point, everyone was thinking we would be comfortable winners.
"But we gave that free-kick away just before half-time and from that point onwards we lost our momentum and our concentration.
"For a team with the experience they had out there, it took too little to lose our rhythm."
Shaun Maloney, Martyn Waghorn, and Marc Antoine Fortune were amongst the first team names to feature.
The weekend sees a return to league action and a long trip to face Charlton at the Valley.