Manchester United owner Malcolm Glazer has suffered a second stroke and been re-admitted to hospital, BBC Radio Five Live reports.
Glazer's condition is not said to be life threatening but he is expected to remain under medical supervision until at least the end of the month.
The American, 77, has been in hospital for most of the last six weeks after suffering a first stroke on 16 April.
His son, Joel, said Glazer is expected to be released in the next few weeks.
Glazer, who is being treated at Florida's Cleveland Clinic, is finding difficulty with speech and movement on his right side.
Joel Glazer, the family's key player at Old Trafford, said his father's recovery would take longer and be more challenging than had originally been thought.
A spokesman for the family insisted that the running of Manchester United was unaffected.
Glazer bought the club for £790m last summer.
hope he's ok