Rom is tentatively scheduled to start Sunday in Philadelphia, John Denton of MLB.com reports.
Rom struggled in his major-league debut Monday versus the Pirates, yielding eight runs -- six earned -- on eight hits and four walks over just 3.2 innings. He probably would have been sent back to the minors Tuesday under normal circumstances, but the Cardinals need him to fill a rotation spot after placing Matthew Liberatore (back) on the 15-day injured list.