Basallo was scratched from Monday's lineup against the Yankees due to left knee discomfort, Andy Kostka of TheBanner.com reports.
Basallo picked up the injury from a collision at home plate during the seventh inning of Sunday's game against the Athletics, per Jake Rill of MLB.com. The Orioles should have an update on the 21-year-old's status once he undergoes more tests on his left knee. Coby Mayo will serve as Baltimore's designated hitter and bat sixth in Monday's series opener.