Strasburg reported noticeable improvement Friday, three days since he left his latest start with what manager Matt Williams termed an "alignment issue" under his shoulder blade.
The 26-year-old righty played catch on the field a few hours after that early exit Tuesday. He saw a chiropractor on Wednesday and played catch again Friday, before the Nationals opened a three-game series against Atlanta.
Williams said Strasburg will throw a bullpen session on Saturday. That will determine whether Strasburg makes his next scheduled start Monday night in Arizona.
Strasburg is 2-3 with a 4.73 ERA in six starts this year. He was an NL All-Star in 2012, and he tied for the league lead in strikeouts in 2014.