Rotherham United manager Andy Scott is looking to add more newcomers quite quickly after making his first two signins.
A chief priority will be a central defender as departures have left Ryan Cresswell as the only recognised one remaining.
Nick Fenton, a regular for the past three seasons, was among those released as was fellow defender Luke Ashworth. Johnny Mullins, who figured in centre defence during the season but is sidelined for several months after a serious knee injury.
Scott is likely to look for someone with experience.