"Sir Alex received treatment in hospital today following a routine check-up several months ago which revealed a minor heart irregularity," said United spokesman Paddy Harverson.
"The procedure went well and Sir Alex is resting at home and is due back at work tomorrow (Friday).
"The treatment revealed he has no underlying problems."
Ferguson, 61, has been in charge at United since 1986 and has led the Old Trafford side to a host of major honours.