Jamie Ward is one of six players who has not been offered a new contract by Derby County, but the club are still considering a deal for John Eustace.
Centre-back Shaun Barker, 32, last week revealed he is leaving and he is joined by striker Ward, 28, and defenders Lee Naylor, 35, Tom Naylor, 23, Zak Whitbread, 31, and Mark O'Brien, 22.
Ward made 29 appearances for the Rams this season, scoring six goals.
Midfielder Eustace, 35, was injured from early January.
But he played 14 times before then and impressed in the holding role and the club are "reviewing his situation".