Mickelson has shut it down after the PGA Championship the last two years, wanting to spend more time with his family. He did not enter the American Express Championship outside London this week, and a year ago skipped the season-ending Tour Championship.
Although speculation has been that Mickelson would not play again until next year's Bob Hope Classic in January, this was the first public statement that he was finished for the year. The PGA said Mickelson told them after the Ryder Cup 'he would not be competing the remainder of the year.'
A spokesman for Mickelson said the PGA of America release had been approved.
The Grand Slam of Golf, to be played Nov. 21-22 at Poipu Bay in Hawaii, is for the four major champions of the year. Jim Furyk was the first alternate because Tiger Woods won two majors. Ernie Els finished second on the alternate list and declined, so the spot went to Weir, who won the Masters in 2003.
The alternate list is only for past major champions and is based on their performance in the 2006 majors.
Filling out the field is U.S. Open champion Geoff Ogilvy.
Mickelson won back-to-back weeks at the BellSouth Classic in Atlanta and the Masters, his third major in as many years. He didn't win the rest of the year, although he had a one-shot lead going into the last hole at the U.S. Open until taking double bogey.