"But I don't want to get ahead of myself," manager Dusty Baker said. "We'll see."
Ross was scheduled to throw a bullpen session Saturday afternoon, but rainy conditions prior to the game might have prevented it. Baker was surprised to see Ross playing catch in the outfield the day before considering the condition of his finger, which he said looked like an open wound.
"It looks ugly," Baker said of the blister. "And I don't know if he can throw a full game like that."
Ross exited his last start after two scoreless innings on Wednesday against the Marlins. He has an impressive 0.54 ERA through 16 2/3 innings this season.
Jamal Collier covers the Nationals for MLB.com. Follow him on Twitter at @jamalcollier. This story was not subject to the approval of Major League Baseball or its clubs.