Mann - who has played over 200 games in all competitions since being signed by Terry Dolan in 1993 - has gone to Conference strugglers Scarborough.
The 29-year-old midfielder has only made 13 starts in the last three years due to a succession of injuries. He has now joined the Seadogs in hope of first team football.
Mann joined Russell Slade's side earlier in the year but returned to Boothferry Park with a hamstring injury before even playing a game. The length of his current spell isn't known, but it could be as long as until the end of the season.
