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Should tonight's FA Cup sixth-round tie between Arsenal and Manchester United end in a draw, the replay date at the Emirates Stadium will be on either Tuesday 7 April or Wednesday 8 April, at 7.45pm.
The would mean the replay could take place just 10 days before the semi-final.
Ahead of tonight's match, Gunners' manager Arsene Wenger says he is still "haunted" by Ryan Giggs stunning goal to win the game for Manchester United when they teams met in an FA Cup semi-final back in 1999. United then went on to win the Premier League, FA Cup and Champions League treble that year.
Show all 11 1 /11Manchester United vs Arsenal combined XI Manchester United vs Arsenal combined XI David De Gea (Man Utd) While David Ospina has impressed recently after taking Arsenal's No 1 shirt from Wojciech Szczesny, David De Gea has been one of the standout players in the division this season.
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Manchester United vs Arsenal combined XI Hector Bellerin (Arsenal) The Spanish youngster is improving by the week, while Antonio Valencia still struggles in the position.
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Manchester United vs Arsenal combined XI Laurent Koscielny (Arsenal) A consistent performer in the centre of the Arsenal defence.
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Manchester United vs Arsenal combined XI Chris Smalling (Man Utd) A more solid choice than Per Mertesacker.
Manchester United vs Arsenal combined XI Luke Shaw (Man Utd) The £30m man just makes the starting line-up ahead of Kieran Gibbs.
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Manchester United vs Arsenal combined XI Francis Coquelin (Arsenal) A revelation in the defensive midfield role for the Gunners. Just gets the nod ahead of Daley Blind due to recent form.
Manchester United vs Arsenal combined XI Santi Cazorla (Arsenal) Possibly Arsenal's best player this season, even wearing the captain's armband on occasions.
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Manchester United vs Arsenal combined XI Angel Di Maria (Man Utd) Has come in for much criticism after his poor run of form, but has still enough to keep Danny Welbeck, not a natural right-winger, out of the side. Theo Walcott is not firing on all cylinders yet after lengthy absence.
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Manchester United vs Arsenal combined XI Wayne Rooney (Man Utd) The captain has three goals in his last four games, and gets in ahead of the inconsistent Mesut Ozil.
Manchester United vs Arsenal combined XI Alexis Sanchez (Arsenal) The first name on the team sheet.
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Manchester United vs Arsenal combined XI Olivier Giroud (Arsenal) Has scored five goals in his last five games for Arsenal despite being met with criticism from his own fans. With Robin van Persie injured, his only opponent is Radamel Falcao - who has scored just four goals in 20 appearances for United.
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"I can still hear the shouts of that team - they couldn't believe it because they were down to 10 men," Wenger said.
"They then won the title, just."
The semi-final draw will take place immediately following the game tonight, broadcast on BBC 1.
The Semi-Final draw
1 Liverpool or Blackburn Rovers2 Bradford City or Reading3 Manchester United or Arsenal4 Aston Villa
Semi-final ties will be played on 18 and 19 April 2015 at Wembley Stadium.
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