Charlie Austin and David Marshall are among six players leaving Queens Park Rangers at the end of the season.
Striker Austin re-signed for the Hoops last summer on a two-year deal having initially been on loan from West Brom.
He has not made enough appearances this season to trigger the contract's second year despite scoring seven goals.
Scotland international goalkeeper Marshall, 37, joined the Championship club in January on a contract until the end of this season.
Dom Ball, Dillon Barnes, Lee Wallace and Keiren Westwood will also leave at the end of the season after their contracts have expired.