We’ve identified 13 players who are out of contract ahead of the 2019/20 season and could be targeted by the Teessiders.
5. Yoann Barbet
Centre-back probably won't be the main concern for Boro's new boss, yet the Teessiders were left a little thin at the back last term. Barbet, 26, knows the Championship well after making over 100 league appearances for Brentford. Photo: George Wood
6. Jonas Knudsen
Another player who has been linked with Boro in the past. A Danish international, Knudsen, 26, possesses plenty of experience following his time at Ipswich. Photo: Catherine Ivill
7. Will Keane
The former Manchester United academy product has seen his career stall after being released by Hull. Keane, 26, did impress during a recent loan spell at Ipswich last season. Photo: YASUYOSHI CHIBA
8. Danny Williams
A regular in the Championship for Reading two years ago, the midfielder, 30, has struggled for game time at Huddersfield in the Premier League. Photo: Shaun Botterill