Ramirez was set to play Friday against Pittsburgh after missing three games with a shoulder injury. He was pulled because of a head cold, and Jake Fox took his spot.
Bradley was taken out of the lineup because of a sore right hip. Sam Fuld took his place.
Ramirez, the team's cleanup hitter and a two-time All-Star, has played in only 43 games. He was on the disabled list with a dislocated left shoulder from May 9 to July 5.
Both Ramirez and Bradley hoped to play Saturday against the Pirates.