Japan's Shingo Katayama and Alex Cejka of Germany have withdrawn from the USPGA Championship because of injury.
Katayama, ranked 52 in the world, was forced to pull out because of a recurring back problem.
The 35-year-old finished in a tie for fourth at the 2001 USPGA Championship at Atlanta Athletic Club.
Cejka, meanwhile, has been laid low by an arm complaint and will also miss the season's final major at Oakland Hills in Michigan.
American duo Michael Allen and Tom Pernice Jr have replaced the duo, with the absence of Katayama and Cejka meaning that 93 of the world's top 100 will now be competing this week.

Transitions Championship - Day Four
Davies claims maiden crown
Transitions Championship - Day Three
Trophee Hassan II - Day Four
Transitions Championship - Day Two
Trophee Hassan II - Day Three
Transitions Championship - Day One
Trophee Hassan II - Day Two
Chris Wood is joining skysports.com to bring you a column that will provide a regular insight into life on tour.
Simon Veness is left amazed by this week's coverage of Tiger Woods' return to golf at the Masters.
Keep up to date with the Europeans and Americans in position to quailfy for the 2010 Ryder Cup.