Aberdeen FC chairman Dave Cormack is having heart surgery this week.
The 63-year-old has been in his leading role at the Dons since November 2019.
The club said yesterday: "On his return to the US earlier this month, Dave Cormack underwent tests that subsequently revealed he required open heart surgery.
"Dave will need a period of time to recuperate after which the prognosis is that he will make a full recovery."
The chairman added: "Having struggled with high cholesterol, I had a heart calcium test performed.
"Having no symptoms, it was a real shock to find out I had three significant blockages in my arteries.
Caught in time
"I am thankful that this was caught in time, and I'll undergo triple heart bypass surgery this week.
"With Alan Burrows coming on board in a week's time as chief executive, and with the support of my fellow directors, I'll be able to take the time I need to rest and recover.
"Alan will pick up the early work done so far on appointing a new manager and lead the process on behalf of the board.
"I want to take this opportunity to thank fellow Dons fans for their incredible support home and away and to reaffirm my commitment to the club we all love."
The Press & Journal says Aberdeen fans were quick to send messages of support to the chairman following the announcement.
Martin Smith wrote: "Not what I was expecting to read tonight. Best wishes Dave Cormack. Take time to rest up. Your health is most important."
Taking pressure off
Cathy Spence says: "Sorry to hear this, but wish our chairman a very speedy recovery. The appointment of Alan Burrows will take a lot of pressure off DC."
Callum Fraser adds: "Puts things into perspective about what is important. Best wishes for a full and speedy recovery."
The Dons are searching for a new manager following the departure of Jim Goodwin last month.
Alan Burrows is moving from Motherwell FC to become Aberdeen's new chief executive and is due to start his new role on February 27.
Interim Dons boss Barry Robson has been in charge for three matches.
A 3-1 home defeat against St Mirren was followed by a 3-1 win against Motherwell at Pittodrie.
The team were beaten 4-0 by Celtic in Glasgow on Saturday.
They take on Livingston at Pittodrie this weekend.