Strasburg, whose DL stint is backdated, exited his last start against the Arizona Diamondbacks Sunday after two innings because of the discomfort. But according to the Washington Post's Jorge Castillo and Chelsea Janes, the impingement has already been "alleviated."
Erick Fedde will be called up by the Nationals and start Saturday against the Colorado Rockies to make his major league debut.
Fedde, 24, is the top-ranked pitcher in the Nationals' farm system.
During a 2017 season that's been split between Double-A Harrisburg and Triple-A Syracuse, the 2014 first-round pick has gone 4-4 with a 3.96 ERA, 1.190 WHIP and 3.29 strikeout-to-walk rate. The right-hander has also recorded eight strikeouts per nine innings through 11 starts.