The Nationals placed Harris on the 60-day injured list Thursday after he underwent right pectoral surgery March 31, Andrew Golden of The Washington Post reports.
After undergoing thoracic outlet syndrome surgery last June, Harris received a clean bill of health heading into spring training. However, Harris almost immediately experienced a setback in his recovery from the surgery, as he was shut down about two weeks ago before manager Dave Martinez acknowledged Tuesday that the right-hander recently required another procedure to remove scar tissue that built up in his arm. Harris will be barred from throwing for the next 3-to-4 weeks, and the Nationals' decision to place him on the 60-day IL implies the right-hander will need at least an additional month beyond that before being ready for game action. Since signing a three-year, $24 million deal with Washington ahead of the 2020 season, Harris has pitched just 23.2 innings for the club.