MILLWALL have told Shane Lowry, Andy Keogh, Liam Feeney and Jack Smith that their contracts will not be renewed in the summer.
The quartet were informed by boss Ian Holloway that their futures lie away from The Den and that they will become free agents when their deals expire next month.
Simeon Jackson is also unlikely to return to SE16 when his short-term contract runs out.
But the Lions have announced that they hope to retain Lee Martin and David Forde, with the duo set to discuss terms in the near future.
NewsAtDen has been told that talks will also be held with Carlos Edwards.
Stefan Maierhofer and Fede Bessone will now become free agents and Millwall are retaining the right to extend their stays at the club at a later point.
In a club statement, the Lions thanked Lowry, Keogh, Smith and Feeney for their efforts and wished them well in their future careers.
Meanwhile, Liam Trotter, who has been on loan at Bolton, will be joining Dougie Freedman's side permanently, although the deal is yet to be announced.