Jonathan Woodgate has re-joined Boro as a First Team Coach.
In a distinguished playing career that saw him represent Real Madrid and England, Woodgate enjoyed two spells with boyhood club Boro, announcing his retirement shortly after the Teessiders' promotion to the Premier League in May 2016.
He becomes the latest addition to Head Coach Steve Agnew's coaching staff, following the appointments of Joe Jordan and Paul Jenkins.
Agnew said: "Jonathan is someone who we know very well, and who in turn knows this club inside and out.
"He brings a wealth of experience from the highest level of the game, and he's a fantastic character. We're delighted to have him on board."