Foulke has one save and a 2.57 ERA in seven appearances this season, but hasn't pitched since April 10. The move was retroactive to April 11.
The 35-year-old Foulke came out of retirement in February to sign a $700,000, one-year contract to return to the A's. The deal allows him to earn up to $2.5 million in bonuses. Before this year, the former A's closer last pitched for the Boston Red Sox in 2006.
This is the sixth time this season the A's have used the DL. In 2007, the team used it 22 times to tie an Oakland record.
