Huddersfield Town - the facts
The Terriers have been involved in eight different Play-Off campaigns, starting in 1991/92 when in the old Third Division they were sounded out by Peterborough United, losing 4-3 on aggregate after a 1-1 draw at London Road. Two seasons later they won promotion to Division One after beating Bristol Rovers (2-1) in a showcase final at the former Wembley Stadium. Under Neil Warnock they eventually went past Brentford (4-3) on penalties after a 2-2 aggregate score-line.
The Bees were to seek revenge during the 2001/02 season when they next made the Division Two Play-Offs, they drew the first leg 0-0 but at Griffin Park were defeated 2-1 and things went from bad to worse when they were relegated to the basement tier of English Football a year later.
However they picked themselves up and soon bounced back - beating Mansfield Town on penalties (4-1) in the Division Three final. They had got to the final after defeating Lincoln City 4-3 over two games.
They made another attempt at winning promotion to the Coca-Cola Championship in 2005/06 but Barnsley stood in their way in the semis and it was the Tykes who would win the White Roses tie and eventually win promotion after seeing off Swansea City - in the final. The first leg at Oakwell ended in a 1-0 victory with Gary Taylor-Fletcher netting with five minutes remaining, but despite Jonathan Worthington's second leg goal the Reds netted three times to book a place in the final in Cardiff.
Sheffield United - the facts
It was the 2006-7 season which ended in disaster for the Blades. After the euphoria of playing in the Premiership - and a couple of impressive results - United's season finally ended badly by the shortest possible margin. Defeat to Wigan on the final day saw them relegated by just one goal.
The next season, with Bryan Robson taking over from Neil Warnock and a new record signing at the club - £4m James Beattie - Blades fans were optimistic about a quick return to the Premiership. However, indifferent results kept the club in the bottom half of the table and cost Robson his job. Former assistant boss Kevin Blackwell took over in February and almost guided United to a play-off spot.
In 2009, United fell at the final hurdle once again. After finishing third in the Championship table - three points off an automatic spot - Kevin Blackwell's side cruelly lost in the play-off final at Wembley to Burnley. An impressive season, which saw the emergence of home-growns Kyle Naughton and Kyle Walker, included a record-breaking run of 15 games without defeat on the road.
But unprecedented injury problems - on top of suspensions and sales - undermined United's aspirations to be amongst the Championship's frontrunners once again in the 2009-10 season. They ended with an eighth position finish. Notable results include a home victory over Sheffield Wednesday and a first win at Ipswich in 35 years.
A disastrous season last year saw the Blades relegated after finishing in 23rd place in the Championship. The club used a total of four managers - Kevin Blackwell, Gary Speed, John Carver (caretaker) and Micky Adams - but a run of 14 games without a win in the league proved insurmountable.
98: The number of previous meetings between the pair in both league and various cups.
Town have won 38 of the clashes and United 26.
One to Watch- Richard Cresswell: Shorn of 35-goal Ched Evans (jailed) and James Beattie (suspended) the availability of the former Stoke striker after an eye infection would be a big boost for Sheffield United.
Cresswell is 34, a former Wednesday player, who has also played for York, Preston and Leeds. He has 139 career goals.