And while the Teessiders are looking for new recruits ahead of the new campaign, many of Boro’s former players are also looking to move on. Scroll down to see which former players are set to become free agents this summer:
1. David Nugent
The striker spent one year at Boro in the 2015/16 season and helped the Teessiders win promotion to the Premier League. After leaving the Riverside, Nugent has spent the last three years at Derby.
Photo: Nathan Stirk
2. Josh McEachran
The midfielder joined Boro on loan in 2013 and has played for Championship side Brentford since 2015.
Photo: Warren Little
3. Alex Baptiste
Baptiste's Boro career was blighted by injuries before he moved to QPR in 2017. The defender also struggled to gain regular game time at Loftus Road and was loaned out to Luton last season.
Photo: Stephen Pond
4. Malaury Martin
Since he left Boro in 2013, Martin has played in Switzerland, Norway and Scotland. The 30-year-old was released by SPL side Hearts at the end of last season.
Photo: Matthew Lewis