PA:
The 77-year-old American businessman was only released from the prestigious Cleveland Clinic in Florida on April 23 after suffering the initial attack.
Now, the Glazer family have confirmed he was readmitted seven days later after another stroke.
Although sources close to the Glazer camp insist the life of the man who bought United for £790million amid such controversy 12 months ago is not in any danger, his speech and mobility are impaired and, unlike on the previous occasion when he spent only seven days in hospital, this time the treatment is likely to take weeks.
"Doctors expect my father to return home in the next few weeks," said Glazer's son Joel.
"As a result of this stroke, his rehabilitation period will be longer and more challenging.
"Our family appreciates all the support and warm wishes that we have received."
At no stage since the takeover has Glazer been involved in any of the major decisions, as he is content to let sons Joel, Ave and Bryan liaise with Manchester-based directors Nick Humby, Andy Anson and chief executive David Gill.
"It is business as usual as far as Manchester United are concerned," said the Glazer source.
"There will be absolutely no change at the club whatsoever."
Although it is not uncommon for patients to suffer another stroke so soon after a first attack, it now appears certain even if Glazer does go on to make a full recovery, he will require months of treatment.