(Carolyn Kaster/AP)

Harper will be available off the bench as a pinch-hitter, the Nationals announced. Harper took batting practice this afternoon without anything seeming out of the ordinary.

Harper, 19, has appeared in all 79 games since the Nationals called him up from Class AAA Syracuse in late April. He has started all but two. In June, he came off the bench because of a sore lower back. Last week, he sat out the first eight inning of the second game of a doubleheader with a bruised ankle.

On Friday, Manager Davey Johnson said in a radio interview that Harper was feeling sick and vomiting before Thursday’s game. Harper is 1 for 8 with a walk over the past two games.