Wales manager Ryan Giggs, who was handed his United debut by Ferguson in 1991, said he was praying for his former manager's recovery.
Reports on Monday night claimed that Ferguson was showing signs of encouragement, with the 76-year-old said to be sitting up and talking to family and friends.
"The news came as a shock to me, like it did to everyone else", said Neil.
"He is such a legend in my eyes". To bring me to one of the biggest clubs in the world was a fantastic feeling for me.
Chelsea boss Antonie Conte said: "I have had the possibility to know him and his wife and to understand that this is a special person".
"I was on the pitch with him last week. Hopefully, he'll recover well".
The two longest-serving managers in the English top flight, Arsene Wenger and Alex Ferguson have had major battles in the past but the 18/19 season will be the first season in the Premier League without both these great figures.
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United's Juan Mata admitted news of Ferguson's condition had a "huge impact" on the current squad.
All of us wish Ferguson the very best in his recovery.
Mourinho also revealed club captain Michael Carrick will start the last game of the league season against Watford at Old Trafford on Sunday in what is set to be his final appearance.
Television presenter Eamonn Holmes, a longtime friend of the football hero and fervent Manchester United fan, described him as an "amazing man".
Mr Jeffrey added: "When you see his working class background, his core ethics and principles, he is someone who I have enormous respect for". They bought Saha; I remember a lot of the boys telling me when I'd go away with England, "I thought you were actually coming".
Scotland's First Minister and SNP leader Nicola Sturgeon joined Scottish Tory leader Ruth Davidson in tweeting their best wishes for Sir Alex.
Ferguson then told his family at bed side: "Aye, the Cup Final is out - but what about Kiev?" Unfortunately, Doncaster lost 1-0. When you're young it's nice to be linked with the biggest clubs in the world.