Andersen joined Charlton from AB Copenhagen
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Charlton goalkeeper Dean Kiely is likely to miss the first six weeks of the season after fracturing a finger.
Danish keeper Stephan Andersen, 23, who made one of the saves of last season in his debut against Manchester United, is likely to deputise for Kiely.
Addicks boss Alan Curbishley said: "The injury puts a dampener on things, but Stephan will now get his chance, which is why we brought him here.
"He got a bit of exposure last year, and there's an opportunity for him."
Kiely's injury could see Curbishley request special dispensation from the Premier League to bring in another loan player.
Charlton already have used their full quota of domestic loan players having signed Alexei Smertin and Jonathan Spector on year-long deals.
Curbishley said: "Our other keepers are very, very young and have not got a first-team game between them, and have not played too many reserve-team games because Stephan played most of them last year.
"It is something we have to keep an eye on, and if it gets any worse we will have to go to the Premier League and ask for special dispensation, because we have had our two loans."
Danish international goalkeeper Andersen joined Charlton from AB Copenhagen just over a year ago for £721,000.
The goalkeeper started his career at Brondby and joined AB (Akademisk Boldklub) Copenhagen from Hvidovre in 2002.