A 2-1 victory over Crystal Palace at the DW Stadium meant Latics extended their unbeaten FA Cup streak to 10 matches as Rosler continues the success of Roberto Martinez's trophy-winning side from last season.
Rosler insists the FA Cup holds a special mystique for him personally. "The FA Cup is something special for me, it's the best cup competition in the world and it's fantastic to be on to the last 16 and if we get a good draw at home, we're moving on hopefully.
"I'm just very happy and hopefully we can start a new momentum with that win today."
It was last year's FA Cup hero Ben Watson who sent them on their way against the Eagles when he broke the deadlock before the interval.
But Palace fought back and substitute Aaron Wilbraham made an instant impact with his first goal since August 2012 bringing them level.
Yet it was former Sunderland star James McClean, officially ending his own goal drought of 12 months despite scoring in last month's abandonment at Sheffield Wednesday, who would score the winner 12 minutes from time.