Robson, who was an inspirational captain for both United and England before launching his own managerial career, credited Ferguson with extending his playing days. He's a strong man and an optimistic man.
And last night Brazilian midfielder Anderson, 30, left his Instagram followers crying after he posted a picture of himself high-fiving the Scot.
"You are the best I have ever known, as a person, as a manager". One week later, he looked in flawless shape.
The Frenchman said: "Before I start I just want to say that at Arsenal we care and I would like to wish my fellow manager Ferguson well, very quickly".
Ferguson won 38 major trophies in just over 26 years in charge of United, including 13 Premier League titles and the Champions League twice. Not only did they claim four league cups, but also five FA Cups.
Ferguson had planned to retire at the end of the 2001/02 campaign but changed his mind after speaking to his wife Cathy and their family.
Sir Alex's son Darren, manager of League One side Doncaster, did not attend his side's final home game of the season against Wigan due to his father's illness.
"What we all hope is that he recovers as soon as possible".
There was no further update on his condition on Sunday evening, although his former club Manchester United thanked the football community for its expressions of concern.
The former manager of Manchester United, Aberdeen, St Mirren and East Stirlingshire, who has won more trophies than any other British manager, could make a full recovery but the likely prognosis will not be known for weeks, if not months. "I appreciate the man", he told reporters at his post-match press conference. Now it's very hard. "It is very hard, but we want to stay close to his family".
"When I heard the news yesterday I really couldn't believe this could happen".
"He will be in my prayers 100%". He will be in a good shape again. I'm always indebted to him.
"He's such an iconic person as everybody knows".
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