The Oakland Athletics made several moves with their pitching staff on Friday, putting reliever Ryan Cook on the 15-day disabled list with a strained right forearm and sending starter Dan Straily to Triple-A Sacramento.

To replace Cook and Straily on the roster, the A's called up relievers Fernando Rodriguez and Joe Savery before a game against the Washington Nationals on Friday night.

Cook suffered a strained forearm in a doubleheader on Wednesday against the Seattle Mariners. Straily struggled with a 1-2 record and a 4.93 ERA in seven starts.

In 11 games with Sacramento this season, Rodriguez is 1-0 with a 0.73 ERA. He last pitched in the major leagues for Houston in October 2012 before Tommy John surgery.

Savery comes to Oakland after posting a 4-0 record with one save and a 3.86 ERA in 10 appearances for Sacramento.

In injury news, A's center fielder Coco Crisp was to undergo an MRI on a strained neck that he suffered while colliding with the wall making a catch on Wednesday.