It has since been claimed that Boro are investigating Monk for the signings which took place during his tenure at the Riverside in 2017, in particular Cyrus Christie, Ashley Fletcher, Ryan Shotton and Marvin Johnson. We take a look at the players who joined Boro under Monk and what has happened to them since:
1. Jonny Howson
After a slow start to his Boro career, Howson was one of the club's most consistent performers last season, featuring in every Championship game. He also played in a variety of positions including right wing-back.
Photo: Alex Livesey
2. Cyrus Christie
The full-back was sold to Fulham just a month after Monk's departure. Christie made 28 Premier League appearances for the Cottagers last season as they were relegated from the Premier League.
Photo: Clive Rose
3. Martin Braithwaite
After falling out with Monk's successor Tony Pulis, Braithwaite appears to be back in favour under new head coach Jonathan Woodgate. It remains unclear if he'll stay at the club this summer though.
Photo: Bruce Rollinson
4. Britt Assombalonga
Boro's record signing was the club's top scorer last season after netting 14 Championship goals. There have been reports the striker had become unsettled under the previous
regime yet he was full of praise for Woodgate while away on international duty last month.
Photo: George Wood