AFC Chairman Nigel Hughes, 49, will require heart bypass surgery and arrangements are being made to fly him to a hospital in the Caribbean.
Family sources say the decision was taken today following angiography which showed severe blockage of an artery.
Hughes arrived at the Caribbean Heart Institute at the GPHC this morning at 7.15 after suffering a heart attack while in the Rupununi yesterday.
He spent the night at the Aishalton Hospital.
A statement today from the Georgetown Public Hospital Corporation said that Hughes was conscious, stable and is being closely monitored.
Sources say his condition has been investigated at the CHI and blockage was detected in a key artery. The plan had been to insert a stent into the artery to open it up but sources say that this is no longer under consideration as the blockage of that particular artery may be as much as 75%.
