The 23-year-old joins Wigan from Stoke City on a one-year deal. McClean made 29 appearances and scored 2 goals last season.
James McClean has been with Stoke City for 6 years after signing from Wigan. He is in training at Wigan Athletic.
McClean has made over 300 appearances in the Premier League and Championship and has joined Wigan for an undisclosed fee.
Wigan hope that McClean will be ready to play in their match against Charlton on Saturday.