Walker went 3-for-5 with a two-run home run and a second run scored in Friday's 7-6 extra-inning loss to the Phillies.
Ginn (8-8) took the loss against the Astros on Friday, allowing three runs on six hits and two walks with four strikeouts over five innings.
Dobbins was removed from Friday's game against the Phillies with right forearm tightness, Derrick Goold of the St. Louis Post-Dispatch reports.
Mathews will be recalled from Triple-A Memphis to start Saturday's game in Philadelphia, Derrick Goold of the St. Louis Post-Dispatch reports.
The Cardinals recalled Fernandez from Triple-A Memphis on Friday, Derrick Goold of the St. Louis Post-Dispatch reports.
The Cardinals placed Pallante on the 15-day injured list Friday with right elbow inflammation, Derrick Goold of the St. Louis Post-Dispatch reports.
The Athletics placed Wilson (shoulder) on the 10-day injured list Friday.
The Athletics transferred Kurtz (thumb) to the 60-day injured list Friday.
The Athletics recalled Morris from Triple-A Las Vegas on Friday.
The Athletics optioned Rashi to Triple-A Las Vegas on Friday.
