Harris (pectoral) suffered another setback and will get an MRI to determine the next steps in his recovery, Andrew Golden of the Washington Post reports.
He has been dealing with lingering effects from thoracic outlet syndrome surgery performed two summers ago, and at this point, it seems unlikely that Harris will ever get back on a mound for the Nationals. The 38-year-old right-hander is in the final year of a three-year, $24 million contract signed ahead of the 2020 campaign, and he's only been healthy enough to pitch 23.2 innings for Washington during that time.