The 32-year-old indicated that it is "fantastic" to be back with his former club after failing to establish himself in Germany, and becomes the Latics' fourth January signingWigan have confirmed that Paul Scharner has returned to the club on loan from Hamburg after leaving the DW Stadium in 2010.
The defender originally joined the Latics in 2005 from Norwegian side Brann, scoring on his debut against Arsenal, before eventually moving on to West Brom in 2010.
| WIGAN LATEST
|5/4||Wigan are 5/4 to be relegated from the Premier League with William Hill
The Austrian, who played for the Premier League club for four and a half years prior to his departure, was delighted to be given the chance to return and help his former team-mates out.
“It really is fantastic to be back," he told the club's official website.
"Wigan will always have a big place in my heart, so to be asked to come back and help the team now is something really special for me.”
The versatile player becomes Roberto Martinez's fourth signing of the January window, after Roger Espinoza, Joel Robles and Angelo Henriquez all made moves.