Four-time major golf champion Rory McIlroy has revealed an "irregularity" with his heart that he has "to keep on top of." The 28-year-old revealed the medical issue to the U.K. Telegraph on Friday in a new interview ahead of his return to golf at the Abu Dhabi Championship next week. "I have a flat T-wave and I'll have to get an [echocardiogram] on my heart every six months and an MRI scan every year," McIlroy said, adding that the issue was discovered after he suffered an infection in China 18 months ago. In 2017, McIlroy had six top 10 finishes but failed to add to his total of 13 career PGA Tour wins. Despite starting the year outside the top 10, McIlroy told the Telegraph that he's ready to compete.