McIlroy declares himself to be 100 percent for PGA (The Associated Press)

SHEBOYGAN, Wis. (AP) -- Rory McIlroy says he's 100 percent and his game appears to be in order.

He was talking about golf, not soccer.

McIlroy played another practice round Monday for the PGA Championship and declared himself ready to go at Whistling Straits. The world's No. 1 player injured ligaments in his left ankle the first weekend in July while playing soccer with friends in Northern Ireland.

Thursday will be his first competitive round since the U.S. Open.

''To play golf it's 100 percent,'' he said. ''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.''

Monday was the first official day of practice for the final major of the year, though it was interrupted throughout the afternoon as thunderstorms rumbled into the area off Lake Michigan and twice suspended play.

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Rory McIlroy, of Northern Ireland, walks down the fairway on the 15th hole during a practice round f …

McIlroy got his work done in the morning. He flew in from Portugal on the weekend and played twice, and the 26-year-old from Northern Ireland said he has been playing with one ball to keep score and try to regain a competitive feel.

He said he played - and walked - 72 holes during his time in Portugal. That's much different - as is the injury - from when Tiger Woods played the 2008 U.S. Open at Torrey Pines with shredded ligaments in his left knee and a double stress fracture in his leg. Woods did not walk 18 holes until he teed it up that week at Torrey Pines.

''It actually feels better when I go at it as hard as I want because my left foot sort of spins out of the way whenever I hit the driver anyway,'' McIlroy said. ''If my left foot was to stay completely flat, like roll on to the left side like a lot of guys do, then it would obviously probably create a few problems. Because mine sort of spins out of the way, it takes a lot of pressure off it.''

McIlroy said he was putting even while he was in a boot to keep his ankle steady.

He began this year with a runner-up finish in Abu Dhabi after a seven-week break, though he conceded it was far different at a major championship.

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Rory McIlroy, of Northern Ireland, watches a tee shot during a practice round for the PGA Championsh …

''I think it's just the competitiveness of feeling what it's like to play a tournament,'' he said. ''It's OK coming back to play Abu Dhabi as your first week back, but playing a major, it's a bit different. Just that sharpness and competitive edge, that's the thing you really hope is there when you come back.''

SCENARIOS:

Jordan Spieth does not have to win the PGA Championship to replace McIlroy at No. 1 in the world. In fact, he might not get there even if he does win his third major.

The Official World Golf Ranking laid out the following scenarios for Spieth to get to No. 1:

- Spieth wins and McIlroy finishes in a two-way tie for second or worse.

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Rory McIlroy, of Northern Ireland, hits a tee shot on the 16th hole during a practice round for the  …

- Spieth finishes second alone and McIlroy is out of the top six.

- Spieth finishes in a two-way tie for second and McIlroy is out of the top 13.

- Spieth finishes in a three-way tie for second and McIlroy is out of the top 33.

The only way for Spieth to finish alone in third and get to No. 1 is for McIlroy to miss the cut.

LATE ADDITIONS

Martin Laird, J.J. Henry and Sean O'Hair are the latest entries to the PGA Championship.

Laird was the first alternate and go in when Shane Lowry won the Bridgestone Invitational. Lowry already was eligible, but because five players at Firestone were not eligible, the PGA kept open one spot.

Henry got the 156th spot on Sunday night by winning the Barracuda Championship in Nevada in a playoff. Then, Graham DeLaet of Canada withdrew Monday because of an injury to his left thumb. He was replaced by O'Hair, who had moved up as first alternate.

That moves Carl Pettersson up to first alternate, followed by Daniel Summerhays and William McGirt.

• PGA Championship
• Rory McIlroy