Defender Robert Kozluk and Midfielders Nick Montgomery, Andy Liddell and Paul Thirlwell along with Strikers Paul Shaw, Luke Beckett and Danny Cadamarteri have been placed on the transfer list.
The following seven will eventually leave the club along with Ashley Ward, Tommy Johnson and Danny Haystead who have all been told there contracts will not be extended and will leave on a free transfer.
Warnock said: "It doesn't necessarily mean that these lads will immediately leave, but we cannot guarantee them first team football and we would like to make other clubs aware that they are available.
"They still form part of the squad but may be sacrificed to bring in other new players or talented youngsters, either by a straight forward transfer or as part of a player exchange."