The German tactician was full of admiration for the former Derry City midfielder and says that he has the potential to go far in his career
McClean, 24, scored two goals in Wigan's 3-1 Championship victory over Ipswich Town at the weekend and Rosler was full of praise for the former Sunderland midfielder.
"James is raw in many ways," Rosler told reporters. "He's not come through the usual academy systems, he's come from Ireland. He has pure talent. There is a lot to work with.
"He is a player who can go all the way as long as he wants to go all the way. He has enormous potential to be even better and it's up to me and up to him to get more out of him and his potential.
"He's relatively young and he brings so much for a player in that position. He's quick, he can dribble, he's unpredictable and he has stamina, he can do it for 90 minutes.
"He can score goals, I think he should score more goals because he's very good in the air, he should attack more crosses."
A Republic of Ireland international, McClean arrived at the DW Stadium in the summer of 2013 from Sunderland and has gone on to make 28 league appearances this season.