Bryce Harper has a small tear in his right UCL, will get a PRP injection and will not throw a baseball for four weeks.
However, Harper can still serve as the designated hitter for the Philadelphia Phillies.
Joe Girardi said Harper will start a throwing program after the four weeks are up.
"I miss playing," Harper, who has played only right field in eight of the 31 games in which he has appeared this season, said. "I miss being out there with my team and playing on the field. It's been tough. I want to get back out there. I want to help this team on both sides of the ball. I miss playing right [field]."