Ferguson, 76, will now continue his recovery as an inpatient at Salford Royal Hospital after having emergency surgery on Saturday.
Former France striker Cantona proved a pivotal signing when Ferguson bought him from Leeds for £1.2million in late November 1992 as United went on to win the inaugural Premier League title.
And Cantona added his words of support for the recovery for his former manager, appearing in a short video clip before hearing the news that Fergie was to leave hospital.
Speaking in a Eurosport video, Cantona said: "Ooaah, this friend of mine, he is not doing so well.
"He is like a mentor to me, he nurtured me, he never judged me.
"He is such a fighter, he will pull through. It’s Fergie time and you will win! You always do."
United said yesterday: "He (Ferguson) no longer needs intensive care and will continue rehabilitation as an inpatient.
"His family have been overwhelmed by the support and good wishes."
We told how the Scot's first words after waking from his op were: "How did Doncaster get on?"
His son Darren, who manages the team, missed their last match of the season (which they lost 1-0) on Saturday to be at Sir Alex's bedside.
'VERY POSITIVE' Sir Alex Ferguson health update given by Jose Mourinho as he tips legendary Manchester United manager to make a full recovery
He reluctantly admitted his recovery will stop him attending his beloved United’s FA Cup Wembley showdown with Chelsea on Saturday week.
But he jokingly told family at his hospital bedside that he could make it to the Champions League final: “Aye, the Cup Final is out — but what about Kiev?”
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