Ross Wolf will be recalled from Triple-A Round Rock on Wednesday to start against the A's.
Nick Tepesch has been scratched from his Wednesday start due to a blister on his right middle finger.
Cubs activated RHP Matt Garza from the disabled list.
Cubs designated RHP Michael Bowden for assignment.
Salvador Perez has been diagnosed with a deep right hip bruise and is considered day-to-day.
Blue Jays' top prospect Aaron Sanchez was placed on the 7-day minor league disabled on Monday.
Orioles activated RHP Miguel Gonzalez from the 15-day disabled list.
Orioles optioned RHP Jair Jurrjens to Triple-A Norfolk.