Forster left the Scottish champions last week to join Premier League side Southampton for a fee of £10m and so Ronny Deila and chief executive Peter Lawwell are trying to find a replacement for the Englishman.
Al Habsi's time at the Latics seems to be as good as over, as manager Uwe Rosler opted for Scott Carson between the sticks in the Lancashire club's opening Championship match against Reading.
However, former Scotland number one Alan Rough, believes that Craig Gordon, who joined Celtic earlier in the summer, is the perfect replacement for Forster, providing the former Sunderland keeper remains fit, even suggesting that on his day, Gordon is the better of the two shotstoppers.
Rough said: "I don't think he's [Forster] hit his peak yet, but certainly Craig, at 100% fit, is the better goalkeeper. He just needs to get back there.
"Celtic can still get the best of him. You never lose the ability, it's all about getting games for him. It will come back naturally.
"It wouldn't take long for a world class keeper like him to get back to where he was."
Celtic are also believed to be interested in Middlesbrough keeper Jason Steele, who has fallen out of favour at Boro under boss Aitor Karanka.
Meanwhile, the Hoops have made their fourth summer acquisition in Belgian defender Jason Denayar, who has put pen to paper on a season long loan deal from Manchester City.