Southgate leaves the Boro after a difficult start to the season
Gareth Southgate followed Steve McClaren as Middlesbrough manager on 7 June 2006.
He was already the team's most successful captain leading them to the Carling Cup in 2004 and the UEFA Cup final in 2006.
But now his managerial reign is all over despite the team of 2009 sitting fourth in this season's Championship.
BBC Tees Sport's betting guru, the Racing Post's Wally Pyrah has been taking a look at the possibilities.
Could Alan Curbishley bring success to the Riverside?
Londoner Alan Curbishley has been out of management since resigning as West Ham boss in September 2008.
After a playing career with Charlton Athletic, West Ham United, Aston Villa, Birmingham City and Brighton & Hove Albion he moved into management when he became joint boss of Charlton Athletic in 1991.
He took sole charge at the Valley in 1995 and went on to manage them in 729 games, winning two promotions and consolidating a Premier League place along the way, before leaving at the end of the 2005/06 campaign.
After a spell as a TV pundit he was appointed as West Ham United manager in December 2006 and led them from a seemingly hopeless position to Premier League safety with seven wins out of their last nine games, including a victory against Manchester United at Old Trafford.
He left Upton Park in 2008 after disagreements over transfer policy and has since returned to punditry.
Wally's odds on Alan Curbishley getting the job 5/2
Another hero as a Boro player but would Souness be a good manager?
A Boro legend as a player, Graeme Souness made 176 appearances and scored 22 goals in his six years on Teesside before moving on to enjoy a hugely successful career with Liverpool.
He cut his managerial teeth in Scotland as player-boss of Rangers where he won league titles and cups before heading back to Anfield to take over the hot seat from Kenny Dalglish in 1991.
Souness spent four years on Merseyside and won the FA Cup but his time there as boss was largely forgettable and he then spent five years at various clubs, including spells abroad with Galatasaray, Torino and Benfica, before returning to England at Blackburn Rovers.
A League Cup win was the highlight of his time at Ewood Park.
His last job as a manager was an ill-fated spell in charge of Newcastle United which lasted two years from 2004-2006.
Wally's odds on Graeme Souness getting the job 10/1
Is Gordon Strachan the man to restore Boro pride?
Gordon Strachan had a hugely successful playing career with Aberdeen, Manchester United, Leeds United and Scotland before turning his hand to management with Coventry City in 1996.
Strachan kept the Sky Blues in the Premier League until relegation in 2001 and he was sacked soon after the start of the 2001-2002 Division One campaign.
His next stop was Southampton where he led the side to an FA Cup final and into the UEFA Cup before resigning to take a break from the game in 2004.
After carving out a successful career as a pundit on BBC Two's Match of the Day 2 show he returned to management with Celtic in 2005 and led them to several league titles, cup wins and runs in the Champions League before resigning in May 2009.
Wally's odds on Gordon Strachan getting the job 6/1
Is it time for a Rioch return?
Bruce Rioch will always be a hero at Middlesbrough for his achievements at the club during their difficult days of the 80s.
Rioch arrived at Ayresome Park in February 1986 and, against a back drop of financial problems which results in the club going into liquidation, guided Boro to two promotions in successive season from Division Three to Division One.
They came straight back down again and Rioch was sacked in March 1990 just after guiding Boro to Wembley in the Zenith Data Systems Cup final.
He went on to manage Bolton, Arsenal and Norwich City amongst others but he'll always be remembered on Teesside as the man who led Middlesbrough with distinction during one of the most turbulent times in their history.
Wally's odds on Bruce Rioch getting the job 50/1
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