The PGA tour said on Tuesday that urine tests would still make up a bulk of examinations but blood screening would be introduced to detect human growth hormone.
Policies regarding player suspensions for illegal drugs use will also be made more transparent.
"If we're not blood testing we're not doing all we can to make sure that golf is a clean sport, so I obviously welcome the news," McIlroy was quoted as saying by the Daily Telegraph ahead of Thursday's first round of the Travelers Championship.
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"If golf wants to be a sport in the Olympics, it needs to get on board with everything that all the other sports do as well.
"I really don't think anyone should be fearful as I don't think that golf has any sort of drug problem at all. You have to be so careful about what you take, but that's part and parcel about being an athlete."
McIlroy, who has battled a recurring rib injury since January, has not won a tournament this year and missed the cut at the U.S. Open earlier this month, but hopes he can still finish the season on a strong note.
"I always felt 2017 was going to be a bit of a transitional year...," he added. "It's still got two majors (left) and I'd like to finish it well.
"But if I look back over my first 10 years as a pro, am I happy with where my career's at? I would say, 'yes, I guess'. But I definitely feel like in the next 10 years, that I can do better."
(Reporting by Aditi Prakash in Bengaluru)
