The No. 1-ranked player in the world, McIlroy suffered ligament damage in his left ankle during a July 4 soccer “kickabout” with friends in Northern Ireland. He withdrew from the Scottish Open, then The Open — where he was also the defending champion — as well as last week’s WGC-Bridgestone Invitational, which he also won last year.

McIlroy arrived at Whistling Straits over the weekend, hitting the driving range on Sunday and playing nine holes in the rain — making at least three birdies — on Monday morning.

“To play golf, it’s 100 percent,” McIlroy said of his ankle. “To go back on a soccer pitch, it wouldn’t be quite ready. But to do what I need to do this week, it’s 100 percent.”

The Westgate Las Vegas SuperBook listed McIlroy’s odds of winning the PGA Championship at 10-1, second only to Masters and U.S. Open winner Jordan Spieth, who was listed at 6-1 on Monday morning.

McIlroy is grouped for the first two rounds of the PGA Championship with Spieth and The Open champion Zach Johnson. They tee off at 11:20 a.m. PT on Thursday.

McIlroy finished third, one shot out of a playoff, when the PGA was played at Whistling Straits in 2010.