Take a look through our gallery to see when contracts are due to run until...
7. Defender: Rocky Bushiri
On loan from Norwich City until the end of the season.
8. Defender: Ryan Edwards
Contract runs until summer 2021.
9. Defender: Sean Graham
Contract expires at the end of the season but has option to extend by 12 months.
10. Defender: Ben Heneghan
On loan from Sheffield United until January 14, 2020.
11. Defender: Curtis Tilt
Contract expires at the end of the season.
12. Defender: Michael Nottingham
Contract expires at the end of the season but has option to extend by 12 months.