Martinez (shoulder) gave up an earned run on a hit over three innings and recorded two strikeouts over two appearances with Double-A Springfield on Friday and Sunday. He'll return to St. Louis on Monday for a medical evaluation by team doctors, Jenifer Langosch of MLB.com reports.
The right-hander was particularly sharp in Sunday's outing, getting through his one perfect frame by throwing 12 of 15 pitches for strikes. Martinez is slated for a bullpen role upon activation, and he's likely to remain in that capacity for what remains of the regular season.