Malcolm Crosby has left his post as assistant manager at Middlesbrough following a re-organisation of Gareth Southgate’s staff.
Crosby, who led Sunderland to the 1992 FA Cup final, joined the club as reserve team boss under Steve McClaren and became Southgate’s number two when he was appointed in June 2006.
He told the club’s official website, www.mfc.co.uk: “Gareth Southgate has decided to make changes at the club and, unfortunately, I am part of those changes.
“I am very disappointed after working for the past three years as Gareth’s assistant.
“But I would like to take this opportunity to thank everyone at the club, from the backroom staff, players and coaches, for making my time at Middlesbrough an enjoyable one.
“I would like to wish them all the best for next season.”
Chief executive Keith Lamb added: “We would like to thank Malcolm for all his work over the last three years and wish him every success for the future.”