Bryce Harper. (AP Photo/Seth Wenig)

Bryce Harper is back in Tuesday’s lineup a day after leaving a game early with lightheadedness. Harper exited Monday’s game in the fourth inning because he didn’t feel well, and Manager Matt Williams believes the outfielder is suffering from the same flu that hit fellow teammates.

Harper is starting Tuesday against the Braves in a game that could clinch the National League East for the Nationals. He received a bag of IV fluids on Monday night after the game, Williams said. He was resting on a couch in the clubhouse much of pregame Tuesday. Williams said Harper felt dehydrated the night before.

“He’s got a little touch of the gunk that everybody else had,” Williams said. “… He’s okay. We’re going to monitor him. He’s not going to come out for batting practice, just hit in the cage and we’ll continue to monitor him during the game.”

If Harper doesn’t feel well again during the game, he could again be replaced against by Nate Schierholtz. On Monday night, Schierholtz entered in the fourth inning and finished the game for Harper. He went 1 for 2 with an RBI and a walk in Harper’s place. The Nationals face right-hander Aaron Harang on Tuesday.

Several Nationals players — Adam LaRoche, Anthony Rendon and Jayson Werth — have dealt with the flu over the past two weeks.