The Australian international has been a fixture in Boro's line-up since signing for the club in 1997.
Started his English league career with Bradford City and was snapped up by Bryan Robson.
Played between Boro's sticks in the 1998 League Cup Final defeat to Chelsea and is the sole survivor from that side.
Carlo Nash Age 31
Former male model who was a late starter as a professional when Crystal Palace signed him from non-league Clitheroe in 1996. Made his name at Stockport County before making the move to neighbours Manchester City.
There he usurped Nicky Weaver as first choice as City won promotion to the Premiership in 2001-2. However, the arrival of big names and old legs in Peter Schmeichel and David Seaman meant he dropped to the bench.
The bench is where he remains at Boro, for whom he signed in the summer of 2003.
Franck Queudrue Age 26
Talented but fiery Frenchman who is no stranger to the FA's disciplinary committee.
A France B international he initially moved to the Riverside Stadium in October 2001 on loan from Lens. After scoring in his debut he swiftly became a crowd favourite at the Riverside.
The left-back joined the club full-time in May 2002 for £2.5m and has been a permanent fixture almost ever since.
Ugo Ehiogu Age 32
One of the Premiership's most dependable defenders, the Londoner made his breakthrough at Aston Villa after joining them from West Brom in 1991.
Has an almost telepathic understanding with Gareth Southgate, his partner at Villa Park who joined him the Riverside the season after his October 2000 arrival.
A one-cap England international but a one-goal international too, he made his England debut in Sven Goran Eriksson's first game in charge.
Has suffered an injury-hit season and has only recently returned to the side after a serious knee injury.
Chris Riggott Age 24
A classy defender, he is the natural successor to Gareth Southgate but is likely to begin the Final on the bench having suffered injuries and the return of Ehiogu.
Started at hometown club Derby and quickly made a reputation for himself in a fading force.
Joined Boro in a joint £5m deal that also took Malcolm Christie, the striker who misses the rest of the season through injury, to the Riverside in January 2003.
Gareth Southgate (MatthewAshton/Empics)
Gareth Southgate Age 34
The skipper will be hoping to lift his second League Cup on Sunday. The former Crystal Palace trainee, who began his career as a defender, made his name at Aston Villa and won the trophy in his first season there in 1996.
A veteran of England since 1996, Southgate is playing some of the best football of his career this season and made a happy return to the international scene against Portugal.
Joined Boro in 2001 after a fall-out with Villa boss John Gregory.
Danny Mills Age 27
Like full-back partner Queudrue, he is no stranger to disciplinary action but remains one of the most solid right-backs in the league.
On loan from Leeds after a run-in with now departed boss Peter Reid, Mills has been a success at Boro this season. Except against Thierry Henry that is. Likely to have to return to Elland Road as Boro have baulked at his high wages.
Began his career at Norwich before joining Charlton in 1998. He joined Leeds in a £4m deal the year after.
Andrew Davies Age 20
Has a silly hairstyle but is one for the future at just 20. Has won a place in David Platt's England U21 line-up after making a good start to the season in place of the injured Chris Riggott and Ugo Ehiogu.
In only his second start he made a horrendous error to gift Leeds a 3-2 win. That error tarnished a fine performance that showed maturity beyond his years.
Colin Cooper Age 37
Veteran defender enjoying his second long spell at the club. Played for the club from 1984 to 1991 and was there when the club collapsed into bankruptcy and was reformed in 1986.
Successful spells at Millwall and Nottingham Forest in a seven-year hiatus from Boro he returned to the club in 1998 and has been a vital squad member since.
Has enjoyed an Indian summer in the absence of Ugo Ehiogu this season.
George Boateng Age 29
Another member of the former Villa contingent on Teesside who joined Boro in the summer of 2002 from the Villans.
A former Feyenoord man, he began his English career in 1997 at Coventry before joining Villa in 1999.
Steve McClaren snapped him up for £5m and his energy has been a fixture in the side ever since. Has only made a recent return to the side after nearly a month out with injury.
Juninho Age 31
A folk hero on Teesside to only rank with Wilf Mannion, a return to a League Cup Final is unfinished business after that losing final in 1997 to Leicester.
In his third spell at the club he calls home, the almost midget-like Brazilian international is still one of the Premiership's biggest talents.
A World Cup winner in 2002 he would just love to win something for a club he first joined in the winter of 1995.
Jon Greening Age 25
Has revived his career at Boro after being surplus to requirements at Manchester United and could one day be a solution to England's left side problems. Though, that said, he is largely right-footed.
A thigh injury has hampered him this season and the Final may come far too early for him. A place on the bench may beckon.
Gaizka Mendieta Age 30
Once one of Europe's best midfielders but now at Middlesbrough, it's not all bad for the Spaniard, who has impressed at the Riverside with the class he so obviously possesses.
Looks likely to stay on a permanent deal from Lazio, who paid a mighty £29m for the Basque blondie in 2001, the year he captained Valencia to the Champions League Final, their second in three years. A Roman nightmare was followed by an unhappy spell at Barcelona and he is rebuilding his career and confidence at the Riverside.
Stewart Downing Age 20
A local boy who has won local hearts with his skills on the left side. At 20, many fans believe he should supplant Bolo Zenden on the wing.
Back at Boro after a short loan spell at Sunderland. Recently impressed in the league win at Old Trafford.
Doriva Age 32
An unsung hero of the team this season, he has impressed with his industry in the midfield engine-room and has complemented George Boateng in that area.
A Brazilian international who formed part of their squad at France 98, he is an old pal of Juninho's and played for FC Porto and Sampdoria before moving to Celta Vigo.
Out of favour in Galicia, he joined on loan in January 2003 and did enough to earn a permanent deal in July.
Stuart Parnaby Age 22
Another local boy, he has made a return to the side of late after losing out to Danny Mills in the right-back role at the start of the season. Often deployed as a defensive midfielder he perhaps will begin the game on the bench.
Boudewijn Zenden Age 28
The Dutch international is enjoying a revival in form on Teesside after his loan move from Chelsea in the summer. Pacy and direct he has rediscovered the form that made him a star of France '98, he scored in the semi-final against Arsenal.
A victim of a coaching merry-go-round at Barcelona after he joined the Catalan giants after that World Cup, he moved to Stamford Bridge in 2001 but failed to ever become a first-teamer as injury struck.
Szilard Nemeth Age 27
Slovakian international who was a thorn in the side of Sven Goran Eriksson during the recent Euro 2004 qualifying campaign yet has been out of form for Boro this season.
Skilful and full of guile, though he may struggle to be a part of the final 16.
Massimo Maccarone Age 25
A young man who has promised quite a lot but has delivered little at Middlesbrough. Boro's record transfer fee of £8.25m was paid for the Italian.
After a reasonable start, injuries and confidence problems have struck and he has dropped down the pecking order at the Riverside behind the likes of Job and Ricketts in McClaren's 4-5-1 formation.
Joseph Desire Job Age 27
A Cameroon international who has benefited from choosing not to visit the African Nations Cup and has enjoyed rare form in front of goal for a Middlesbrough striker of late.
Usually deployed as man-in-the-hole, he has recently played as a lone striker with some success, including a recent winner at Old Trafford. Perhaps favourite to start.
Michael Ricketts Age 26
Another goalshy striker who is yet to fire fully in the red of Middlesbrough, Ricketts is a target man who made a surprise move to the Riverside in January 2003.
Made his name in the Premiership with Bolton in a tremendous 2001-2 season, even getting the chance to begin an abortive England career which lasted one game.
Only one goal from open play this season but has Cardiff form, having scored in the 2001 Play-Off Final for the Trotters. Would love the opportunity to put one over his old club, with whom he parted acrimoniously.