Gonzales (face) isn't in the lineup for Saturday's game against the Red Sox.
Valdez went 1-for-4 with a double, two RBI and a run scored Friday against the Red Sox.
Reynolds went 2-for-4 with a double, three runs scored and a stolen base in Friday's 8-4 win over the Red Sox.
Lowe went 1-for-4 with a three-run home run Friday against the Red Sox.
Flores went 3-for-4 wit ha home run and two RBI in Friday's 8-4 win over the Red Sox.
Chandler (6-8) picked up the win in Friday's 8-4 victory over the Red Sox, allowing two runs on four hits and two walks over five innings. He struck out five.
Montgomery recorded his fourth save of the season in Friday's 8-4 win over the Red Sox, striking out the only batter he faced.
Gonzales was removed from Friday's game against the Red Sox after getting hit on the head by a pitch.
Johnson has been diagnosed with a torn ACL and LCL in his left knee and will undergo season-ending surgery, Colin Beazley of the Pittsburgh Post-Gazette reports.
The Pirates placed Ramirez on the paternity leave list Friday.
