Hull's Fraizer Campbell will be out of contract this summer.
The Teessiders will, therefore be looking ahead to next season and players who could bolster their chances of a Premier League return. With that in mind, we take a look at EVERY Championship player whose contract is set to expire in the summer. Scroll down and click through the pages to see the players set to be released by each Championship club - could Boro target any of them?
Mark Bunn, Tommy Elphick, Alan Hutton, Mile Jedinak, Micah Richards, Jed Steer, Glenn Whelan.
Tomasz Kuszczak, Michael Morrison, Viv Solomon-Otabor.
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Craig Conway, Paul Downing, Ben Gladwin, Jayson Leutwiler, Jack Rodwell.
Mark Beevers, Will Buckley, Clayton Donaldson, Lloyd Dyer, Jack Hobbs, Mark Little, Craig Noone, Gary O'Neil, Josh Vela, David Wheater, Ben Williams, Marc Wilson.
Yoann Barbet, Lewis Macleod, Josh McEachran, Moses Odubajo.
Frank Fielding, Stefan Marinovic, Niki Maenpaa, Eros Pisano, Jamie Paterson, Antoine Semenyo.
Efe Ambrose, Nick Blackman, Craig Bryson, Jacob Butterfield, Ashley Cole, Bradley Johnson, David Nugent, Marcus Olsson, Alex Pearce, Kelle Roos.
Fraizer Campbell, Evandro, Marcus Henriksen, Will Keane, David Marshall, Ondrej Mazuch, Robbie McKenzie, Liam Ridgewell, James Weir.
Tom Adeyemi, Luke Chambers, James Collins, Simon Dawkins, Josh Emmanuel, Dean Gerken, Jonas Knudsen, Jordan Spence, Grant Ward.
Kamil Miazek, Joe Stanley, Jamie Thornton, Lucas Odunston, Alex Wollerton, Niall Huggins, Theo Hudson, Luke Lyons, Harrison Male.
Jordan Archer, Tom Elliott, Lee Gregory, Tom King, David Martin, Conor McLaughlin, Steve Morison, Ryan Tunnicliffe.
Todd Cantwell, Timm Klose, Ivo Pinto.
Juan Rafael Fuentes, Stephen Henderson, Jamie Ward.
Andy Boyle, Michael Howard, Tommy Spurr, Tom Stead.
Jake Bidwell, Jordan Cousins, Darnell Furlong, Grant Hall, Joel Lynch, Angel Rangel, Olamide Shodipo, Pawel Wszolek.
Callum Harriott, Anssi Jaakkola, Paul McShane.
Laurence Bilboe, Alex Bray, Anthony Forde, Akeem Hinds, Joe Mattock, Joe Newell, Darren Potter, Lewis Price, Jon Taylor, Ryan Williams.
Paul Coutts, Martin Cranie, Conor Washington, Jake Wright.
Almen Abdi, George Boyd, Gary Hooper, David Jones, Kieran Lee, Marco Matias, Frederik Fisker Nielsen, Connor O'Grady, Liam Palmer, Fraser Preston, Daniel Pudil, Keiren Westwood.
Charlie Adam, Darren Fletcher, Jakob Haugaard.
Wilfried Bony, Leroy Fer, Adam King, Luciano Narsingh, Martin Olsson, Wayne Routledge, Mike van der Hoorn.
Gareth Barry, Chris Brunt, Rekeem Harper, Wes Hoolahan, Tyrone Mears, James Morrison, Boaz Myhill.
Luke Burgess, Owen Evans, Darron Gibson, Dan Lavercombe, Shaun MacDonald, Gavin Massey, Callum McManaman, Chris Merrie, Jonas Olsson, Nick Powell.