"Sir Alex Ferguson has undergone surgery today for a brain haemorrhage". His family requests privacy in this matter.
"A great rival but also a great friend who supported this club during its most hard time, it is hoped that Sir Alex will make a full recovery".
An ambulance was called to the Scot's home in Cheadle, near Manchester, in northwest England at 9:00 am (0800 GMT) on Saturday, reported the Daily Mail. His son Darren manages Doncaster Rovers but did not not take charge of their League One match against Wigan on Saturday.
"I met Sir Alex after the first leg against Roma, he was there with Gerard Houllier", Klopp said.
United ended a 26-year wait for the league title by triumphing in the inaugural season of the Premier League in 1992-93, before claiming their first ever league and FA Cup double the following year. I was hoping it wasn't true.
"I'm not surprised everyone has come out with these best wishes and we are all hoping for the best possible outcome for him".
Not only fans, but several former players have been posting messages of support on social media too.
Be strong boss, ' wrote Carrick. Sending prayers and love to Cathy and the whole family x'.
Real Madrid forward and five-time Ballon d'Or victor Cristiano Ronaldo kick-started his career at United under Ferguson from 2003 to 2009.
Manchester City manager Pep Guardiola also sent his close friend his well wishes, revealing Ferguson had recently taken him out for dinner to congratulate him on winning the Premier League title with City. Be strong boss xx. Our thoughts were only with Sir Alex and his family.
"You think Sir Alex is really indestructible, we've all been brought up with him". "Edwin & Annemarie", said the couple's Twitter post.
The Football Association, PremierLeague, Fifa, Uefa and other clubs from across Britain and around the world tweeted their best wishes along with a host of current and former United stars.
Wenger, speaking to the Mail on Sunday, said: "I am concerned and I'm thinking about him and his family".
"Hang in there Sir Alex", explained town captain Vincent Kompany, who's won the premierleague three days since 2012.
Several football clubs such as Manchester City, Leicester City, AC Milan and Al Ahly SC wished Ferguson a full and quick recovery after the surgery.
The most successful manager in British soccer history, Ferguson has emerged in Goodhealth since finishing his intense direct participation in instruction.
Ferguson retired a champion in 2013, lifting the premierleague trophy to get a 13th period to choose the club's haul of English championship crowns to some album 20.