The 48-year-old joined Boro in May 2018, while many supporters have criticised the club’s recruitment policy in recent years. We take a closer look at the 14 players who have signed for the Teessiders over the last 18 months – loans and permanent deals. Scroll down and flick through our picture gallery to see the full list:
5. Muhamed Besic - August 2018
After an impressive loan spell at Boro the previous season, Besic re-signed for the Teessiders on loan ahead of the 2018/19 campaign. The Bosnian's second stint at the Riverside was less influential, yet he still made 37 league appearances. Photo: George Wood
6. Sam McQueen - August 2018
A detrimental ALC injury cut short the defender's loan deal at the Riverside. McQueen made just seven senior appearances for the Teessiders. Photo: Getty Images
7. Danny Batth - August 2018
After some decent performances for Boro, the centre-back was recalled from his loan spell last January. Batth returned to parent club Wolves before signing permanently for Stoke City days later. Photo: Getty Images
8. George Saville - August 2018
The midfielder has struggled to make a significant impact since his reported £7million move from Millwall. Saville, 26, has started Boro's last five games but hasn't performed on a consistent basis. Photo: George Wood