From some cut-price bargains under Tony Mowbray to promotion-winning acquisitions under Aitor Karanka, we’ve ranked Boro’s best 11 signings over the last 10 years. Scroll down and flick through the pages of our picture gallery to see the full list of players and whether you agree or disagree with the selections and order:
9. (3rd) Daniel Ayala (from Norwich - undisclosed fee)
Nearly seven years after he joined the club in 2013, the towering centre-back remains a key player for Boro. Ayala's partnership with Ben Gibson gave the Teessiders a solid base under Karanka and the Tessider rarely lost when the pair played together. Photo: Harry Murphy
10. (2nd) George Friend - (from Doncaster - undisclosed fee)
An absolute steal. It's believed Friend cost Boro around £100,000 in the summer of 2012 and his influence since then has been massive. The defender has been a key player on the pitch and a great role model off it since moving to the Riverside. Photo: Tony Marshall
11. (1st) Grant Leadbitter (from Ipswich - free agent)
Tony Mowbray knew he was signing a natural leader when he brought Leadbitter to the Riverside in 2012. The all-round midfielder spent six and a half years at Boro and captained the side to promotion in 2016. Photo: Alex Livesey