MANCHESTER, ENGLAND - MAY 16: Manchester United celebrate winning the Barclays Premier League trophy after the Barclays Premier League match between Manchester United and Arsenal at Old Trafford on May 16, 2009 in Manchester, England

26 May 1999: The Manchester United team celebrate with the European Cup after winning the European Champions League Final against Bayern Munich in the Nou Camp Stadium, Barcelona, Spain. Manchester United won 2 - 1 with both United goals scored during injury time, to secure the treble of League, FA Cup and European Cup

13 September 1997 FA Premiership, Manchester United v West Ham United, David Beckham and Gary Neville celebrate a United goal

MANCHESTER, ENGLAND - MAY 16:The Manchester United squad celeberate with the Premier League trophy in the dressing room after the Barclays Premier League match between Manchester United and Arsenal at Old Trafford on May 16 2009 in Manchester, England

MANCHESTER, ENGLAND - MAY 16: Rafael Da Silva and Wayne Rooney of Manchester United celebrate after the Barclays Premier League match between Manchester United and Arsenal at Old Trafford on May 16 2009, in Manchester, England

MANCHESTER, ENGLAND - MAY 16: The Manchester United squad celebrates with the Premier League trophy after the Barclays Premier League match between Manchester United and Arsenal at Old Trafford on May 16 2009 in Manchester, England

MANCHESTER, ENGLAND - MAY 16: Anderson of Manchester United celebrates after the Barclays Premier League match between Manchester United and Arsenal at Old Trafford on May 16 2009 in Manchester, England

MANCHESTER, ENGLAND - MAY 11: David Beckham of Manchester United celebrates in the dressing room with the FA Carling Premiership trophy after the match between West Ham United v Manchester United at Upton Park on May 11, 1997 in London

MANCHESTER, ENGLAND - MAY 22: Paul Scholes, Ryan Giggs, Peter Schmeichel and Andy Cole of Manchester United celebrate in the dressing room after the FA Cup Final between Manchester United v Newcastle at Wembley Stadium on May 22, 1999 in London. Manchester United 2 Newcastle United 0

Ryan Giggs, Jesper Blomqvist, Ronny Johnsen, Jaap Stam, David May, Nicky Butt, Wes Brown, Denis Irwin, Jonathan Greening, Teddy Sheringham, Andy Cole, Dwight Yorke, Ole Gunnar Solskjaer, Peter Schmeichel, Raimond van der Gouw, Philip Neville and Gary Neville of Manchester United celebrate his victory with the trophy during the UEFA Champions league final match between Manchester United and Bayern Munich on May 26, 1999 in Camp Nou, Barcelona, Spain

MANCHESTER, ENGLAND - APRIL 22: Robin van Persie of Manchester United celebrates at final whistle of the Barclays Premier League match between Manchester United and Aston Villa at Old Trafford on April 22, 2013 in Manchester, England

MOSCOW, RUSSIA - MAY 21: Players of Manchester United celebrate their victory at the UEFA Champions League Final match between Chelsea and Manchester United at the Luzhniki Stadium on May 21, 2008 in Moscow, Russia

MANCHESTER, ENGLAND - MAY 27: Andy Cole and Dwight Yorke of Manchester United celebrate with the Premiership Trophy and the FA Cup in front of thousands of fans during the home coming Treble Parade on May 27, 1999 in Manchester

MOSCOW - MAY 21: Patrice Evra and Ryan Giggs of Manchester United celebrate victory following the UEFA Champions League Final match between Manchester United and Chelsea at the Luzhniki Stadium on May 21, 2008 in Moscow, Russia

MANCHESTER, ENGLAND - APRIL 22: Manager Sir Alex Ferguson of Manchester United celebrates in the dressing room after the Barclays Premier League match between Manchester United and Aston Villa at Old Trafford on April 22, 2013 in Manchester, England

MOSCOW - MAY 21: Edwin Van der Sar of Manchester United celebrates with the trophy following his team's victory during the UEFA Champions League Final match between Manchester United and Chelsea at the Luzhniki Stadium on May 21, 2008 in Moscow, Russia

MANCHESTER, ENGLAND - MAY 16: Peter Schmeichel celebrates with Jesper Blomqvist, Raimond van der Gouw, Dwight Yorke, Steve McClaren and Jim Ryan after the FA Carling Premiership match between Manchester United v Tottenham Hotspur at Old Trafford on May 16, 1999 in Manchester, England. Manchester United 2 Tottenham Hotspur 1