Martinez (undisclosed) was cleared to resume baseball activities Monday, Anne Rogers of MLB.com reports.
Martinez was placed on the 10-day injured list Aug. 4 for an undisclosed reason, but Mark Saxon of The Athletic relayed Monday that the right-hander was among the slew of Cardinals players who tested positive for the coronavirus. Now that he's completed a quarantine and is testing negative for COVID-19, Martinez will now begin ramping up at the Cardinals' alternate training site. It's unclear what shape the right-hander is in, and the length of his throwing program before returning to the rotation hasn't been determined yet.