Rudy Gestede, Jonny Howson, Daniel Ayala, Marvin Johnson, Ryan Shotton and George Friend will all see their deals expire in the next few months – while there’s also uncertainty about Aynsley Pears’ situation. Scroll down and flick through the gallery to see how Boro could line-up if the aforementioned players move on:
1. GK: Dejan Stojanovic
Aynsley Pears' situation remains unclear, and it's believed Boro have an option to extend the stopper's contract by a year. After starting at Charlton last time out, the No 1 jersey looks like Stojanovic's to lose. Photo: Mario Carlini / Iguana Press
2. RB: Djed Spence
Spence still hasn't played in a flat back four for the senior side but has shown plenty of potential on the flank this season. Photo: Justin Setterfield
3. CB: Sam Stubbs
The 21-year-old centre-back has gained first-team experience in Scotland and Holland this season. With George Friend, Ryan Shotton and Daniel Ayala all out of contract this summer, Stubbs could be needed next term. Photo: JPI Media
4. CB: Dael Fry
Despite injury setbacks this season, Fry has been a first-team regular when fit. Photo: Alex Davidson