Former Swansea City and Leeds United manager Garry Monk was appointed in the summer of 2017, following the club's relegation from the Premier League.
Monk had guided Leeds to within touching distance of the Play-Offs the previous season, and was handed substantial funds with the aim being to lead Boro to an immediate Premier League return.
At £15m Britt Assombalonga became the club's record signing, and almost £50m was invested in new faces that included Jonny Howson, Cyrus Christie, Darren Randolph, Ashley Fletcher, Martin Braithwaite, Ryan Shotton, and Marvin Johnson.
Boro suffered only two defeats in the opening 11 games in all competitions, but a six-game winless streak left team on the periphery of the Play-Off places. Sunderland were beaten at the Riverside, but there were disappointing defeats at both Millwall and Bristol City as Boro found consistency hard to come by.
Monk parted company with the club on December 23 after his side had come from behind to win 2-1 at Sheffield Wednesday.
In March 2018, he was installed as Birmingham City manager and his first game in his new role was against a Boro side now managed by Tony Pulis. Boro were 1-0 winners on the night.