Andy Murray was set to have Sir Alex Ferguson supporting him from the Royal Box in the Wimbledon semi-final against Roger Federer.
Two years ago Murray described advice from Ferguson as "gold dust" as he went all the way to the title.
The former Manchester United manager has attended many of Murray's biggest matches, including during his run to the 2012 US Open title.
Ferguson, 73, was due in the Royal Box alongside a host of major sporting stars, including India cricket favourite Sachin Tendulkar, former footballer Thierry Henry, and Wimbledon past champions Bjorn Borg, Lindsay Davenport and Manuel Santana.
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Sir Alex Ferguson will attend Manchester United's FA Cup fifth-round clash at Preston North End on Monday, with the League One club stepping up security for the Scot's first trip to Deepdale since his son Darren was sacked.
Former United manager Ferguson will be among those watching on as he witnesses his old club take on the team which axed his son five years ago.
Darren Ferguson left North End bottom of the Championship in December 2010, with his father swiftly recalling three players who were on loan with Preston from United in a move which appeared motivated by revenge.
Ferguson senior later claimed Ritchie De Laet, Josh King and Matty James chose themselves to return to Old Trafford.
Despite retiring as manager of Manchester United, Sir Alex Ferguson still earned £2.17million from the club in a nine month spell from October 2013 to June 2014.
The Scot was paid £100,000 a day in his role as a global ambassador for United, as revealed in the club's accounts, as calculated by the Daily Mail.
Ferguson still has a key role promoting the club around the world.
The accounts also revealed that David Moyes and his backroom staff were paid a collective £4.82million in pay-offs by the club after their contracts were terminated.
Moyes, as well as Steve Round, Phil Neville and Jimmy Lumsden all departed after a poor spell in charge at the club.
Former Germany goalkeeper Oliver Kahn thinks Sir Alex Ferguson has never forgiven him for snubbing the chance to join Manchester United.
Kahn told German fans' website Fanbookz that he had a "serious offer" from the Red Devils in 1994, but he instead opted to join Bayern Munich, with whom he played 14 seasons before retiring in 2008.
"Alex Ferguson has never forgotten that," Kahn said. "He still holds that against me to this day."
According to former United goalkeeper Peter Schmeichel, Kahn committed a cardinal sin.
"You never say no to Sir Alex," the Dane said on the same programme. "It would have been a good experience for Kahn (at United)."
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Former Manchester United manager Sir Alex Ferguson recalled Alfredo Di Stefano's "wonderful balance and poise" as he paid tribute to the Real Madrid legend following his death.
Sir Alex told BBC Radio 5 live that Di Stefano "was without question in that group of great, great players".
"I had the pleasure as a young man of being influenced by the great Real Madrid and Di Stefano. His head was up all the time - he was a fantastic footballer", he said.
"For Real Madrid it is a terrible loss because his presence was always there."