He is slated to return to competitive golf at next week's Abu Dhabi Championship, and plans to play eight events before the Masters, his most ambitious schedule ahead of Augusta National in the 10 years he has been eligible.
The four-time major victor cut short his 2017 schedule in order to undergo treatment on a rib injury, which he says has now healed, and news of his latest health setback had led to concerns over his plans for this year.
"But I've got a bit of an irregularity with my heart that I have to keep on top of".
"It revealed I had a slight heartbeat irregularity called a flat or inverted T wave. For now, I just need to stay on top of it and have to stay fit", the Northern Irishman told the newspaper. "Hey, I was planning on doing that anyway", McIlroy said.
In a post on Saturday morning, McIlroy said: "Yesterday [Friday], I did an interview with the Daily Telegraph where I spoke about a range of topics regarding the last 3 months of my life".
McIlroy fell from No. 2 in the Official World Golf Rankings at the beginning of 2017 to No. 11 at the start of 2018 after not winning past year.
After revealing his heart scare, Rory McIlroy says he's ready to get back to action for first time in 4 months.
"I don't judge it like that", McIlroy added in the newspaper interview. "I just don't feel that now", he said.
"I know that I'm on track to where I want to be". I think about number of wins, the ability of the players against me, the number of majors the others have. "Let's just say that between now and when I signed off a year ago, I feel way more optimistic, focused, motivated, purposeful".
The former world number one, who has four majors on his CV already, has made it clear that he is fully fit and raring to go after failing to win a tournament anywhere in the world past year. "And I will give myself the best chances this season".