The fullback moves to Denmark as a free agent RSC Charleroi.
Flanagan and Agger are former Liverpool teammates and Koge chief Per Rud said: "We are of course aware that Jon Flanagan has not played that much in the last year, but he is in good shape, and Daniel Agger has received really good references about him from Steven Gerrard at Rangers.
"We believe that Jon Flanagan can become a major player here at the club."
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