"Chris is a world-class goalkeeper and a smashing pro," said the Wigan boss. "It was always our intention to make the deal permanent and it's great news that we've got it all sorted so quickly.
"His calibre has never been in question and he's been brilliant for us since he's arrived.
"I'm blessed with three excellent keepers in Kirky, Mike Pollitt and John Filan, who's currently on loan at Doncaster. The competition is fierce and that's how I like it."