"He's feeling a lot better," Williams said. "He could play. We'll see how he reacts after [batting practice] and all that stuff in the cage."
Kobernus did end up seeing action, going 1-for-1 with a single off the bench.
Kobernus, ranked as the team's No. 7 prospect by MLB.com, is one of a few Nationals who have dealt with flu-like symptoms this spring, a list that includes infielder Zach Walters, and outfielders Bryce Harper and Tyler Moore.
Walters did not travel to Lake Buena Vista for Thursday's game despite participating in workouts earlier in the day.
"We left him home because he's in Day 2 of it," Williams said. "Everybody else seems to be good."
Joe Morgan is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.