Millwall have released former Chelsea midfielder Jody Morris, as well as defender Adam Cottrell. Morris, 28, made 65 league appearances after joining the Lions from Rotherham in 2004 - but had just four first-team outings last season.
Meanwhile, defender Cottrell, 20, leaves the New Den a year after he arrived from neighbours Charlton.
He did not make a senior appearance for the Lions, but played 17 games on loan at Weymouth in the spring.
Midfielder Marvin Elliott has been offered a new deal.
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