Winnall left Barnsley to sign for bitter rivals Sheffield Wednesday in January.
HITC Sport understands Premier League and Championship clubs are eyeing the Barnsley defender.
Barnsley defeated Brentford 2-0 over the weekend, thanks to Angus MacDonald's performance at the back.
A former Sunderland youth-teamer and Lucas Radebe's long-term heir: the Championship is the place to be for radio-blocking bargains.
HITC Sport understands Barnsley set to sign non-league defender.