Rengifo (hamstring) is scheduled to serve as the designated hitter in Saturday's Cactus League game against the A's, Rhett Bollinger of MLB.com reports.
Rengifo exited Tuesday's exhibition after aggravating a left hamstring injury, but he's expected to rejoin the lineup Saturday after taking a few days off. Assuming he's plays this weekend with no issues, the 27-year-old should be ready to go for Opening Day.