Many players will see their current deals expire at the end of June which could be problematic if the 2019/20 campaign runs deep into the summer months. Scroll down and flick through our picture gallery to see the full list of players who are nearing the end of their contracts:
1. Barnsley
Alex Mowatt (above) ,Mamadou Thiam, Kenny Dougall, Dani Pinillos, Samuel Sahin-Radlinger, Jared Bird Photo: Lewis Storey
2. Birmingham
Maikel Kieftenbeld, Kerim Mrabti, Jacques Maghoma (above), Cheick Keita, Wes Harding, Craig Gardner, Lee Camp, Jonathan Grounds Photo: Nathan Stirk
3. Blackburn Rovers
Amari'i Bell, Elliott Bennett, Stewart Downing (above), Danny Graham, Richard Smallwood, Jayson Leutwiler, Dominic Samuel Photo: Lewis Storey
4. Brentford
Henrik Dalsgaard (above) Kamohelo Mokotjo, Nikolaos Karelis, Luka Radic, Joel Wollacott Photo: Alex Davidson