The Latics boss lauded the winger for his contribution as the Championship side triumphed over Premier League opposition
With the score poised at 1-1 after 78 minutes, the Republic of Ireland international struck his first official goal for the club to ensure that the cup-holders progressed to the next stage of the competition.
Speaking after the game, the Latics boss hailed McClean's performance and believes that the goal will be a confidence boost for the 24-year-old.
"Thankfully, James scored the winning goal and he played well, as did all of our wide players," Rosler told the club's official website.
"Together with Callum [McManaman] the pair gave us great momentum going forwards and looked a constant threat.
"James deserved that goal for his efforts and it will do his confidence a lot of good.
"Overall I think we should all be very happy with how we attacked and overcame a Premier League side, something which should stick in the memory.
"I've really enjoyed our home games and the atmosphere our fans have created, which has been fantastic. Now we need to go to Middlesbrough on Tuesday night and make them proud of their team once again."