The Latics are in the bottom three with 10 games left to play before the end of the season.
The Wigan goalkeeper told The National: "It's because we have belief that we can do it again. It was special last year, beating all those teams. We can repeat that.
"We've had a lot of injuries, especially in defence. The defence and the goalkeeper are the most important part of a team and when it's broken up by injury, it's difficult.
"I know the regular players and know what they are going to do, that becomes harder when the team has to change. Now, everyone is back and we feel confident."
Wigan face Newcastle United tomorrow afternoon.