Portsmouth have allowed youngsters Jordan Hughes, Gael Nlundulu, Gautier Mahoto and Danijel Subotic to leave Fratton Park.
Midfielders Hughes, Nlundulu and Mahoto - who signed professional contracts in 2009 - and striker Subotic have left the cash-strapped club by mutual consent.
Subotic joined Pompey in January 2008 but never made an appearance for the first team.
Mahoto made one appearance for the first team, as a substitute against Hereford in the Carling Cup last season.
Nlundulu was on the bench for Pompey's 0-0 draw with Blackburn at Fratton Park in April, while Hughes was never included in a first-team squad.
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