The Frenchman - writing his end-of-season message as part of the organisation's 2012-13 review - labelled the 71-year-old as one of football's "great servants".
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"The 2012-13 season will also be remembered as the year one of the game's great servants called time on his career," the former European Footballer of the Year wrote.
"Twice a winner of this competition as manager of Manchester United, Sir Alex Ferguson has left an indelible imprint on the Champions League.
"It is strange to think that a coach who has featured so prominently across the European football landscape over three decades will not be seen issuing his instructions on the touchline next term but we hope he will continue to play a role with us behind the scenes, helping shape the direction of the sport and safeguarding its future.
"We wish him well in his well-earned retirement."