Stephen Warnock and Conor Sammon have not been offered new deals by Championship side Derby County.
Ex-England, Liverpool and Blackburn left-back Warnock, 34, made 22 appearances for the Rams last season but joined Wigan Athletic on loan in February after Paul Clement was sacked.
Warnock played 11 times for the Latics, helping them win the League One title.
Striker Sammon, 29, spent last season on loan with Sheffield United in League One, scoring six goals in 19 starts.
Winger Alefe Santos has been offered a new deal, but fellow out-of-contract Under-21 players Ivan Calero, Tom Koblenz, Mats Morch, Kwame Thomas and Shaquille McDonald have been released.