Still unclear is whether his injured left ankle will be healthy enough for a run at back-to-back PGA titles.
The McIlroy news isn’t all that surprising, given the severity of his injury – a total rupture of the left ATFL and associated joint capsule damage – and the general timetable for a return, which medical experts estimated was anywhere from 10 days to six weeks. McIlroy said he was injured while running toward a soccer ball during a friendly game with friends on July 4.
Kirk broke his right hand while playing with his children.
McIlroy is still ranked No. 1 in the world, on the strength of three wins in 12 starts this season, but Jordan Spieth will have a chance to overtake him at Firestone. McIlroy will now miss at least three scheduled starts because of the injury. Last year, he shot 15-under 265 at Firestone and won by two shots over Sergio Garcia.
A healthy McIlroy would pose a significant threat at Whistling Straits, which places a premium on driving. When the PGA was last held there, in 2010, he finished in a tie for third, one shot out of the playoff.