Middlesbrough have one of the thinnest squads in the division, but how does it compare to their league rivals?
Scroll down and flick through the pages of our picture gallery to see the number of senior players registered at each Championship club:
21. Swansea
Squad size: 29 senior players Photo: David Rogers
22. Nottingham Forest
Squad size: 31 senior players Photo: Matthew Lewis
23. Luton
Squad size: 32 senior players Photo: Julian Finney
24. Sheffield Wednesday
Squad size: 34 senior players Photo: David Rogers