Mets players were taking flips in an indoor batting cage at Coors Field when a baseball off Lucas Duda's bat ricocheted and struck Young below the right eye.
A CT scan and X-rays performed at a local hospital revealed a bruise, but no fracture or other serious damage. Young had mild swelling and a mark below his right eye after the Mets' 5-1 win against the Colorado Rockies and complained of a headache.
He officially is day to day.
"Anybody gets hit with a baseball in the head, you're going to experience some discomfort there," Young said before the Mets departed for their series in Miami. "They took me to go get X-rays and a CT scan and everything came back good. It's just a little headache right now."
Juan Lagares, who replaced Young in the starting lineup, went 3-for-5 with a double and two runs scored, extending his hitting streak to a career-best 13 games with a single to start the game.
Young had been slated to start for the first time in four games. He has been all but relegated to fourth outfielder since Lagares returned from the disabled list Thursday.
Young also missed an opportunity to start in front of his father, Rockies first-base coach Eric Young Sr.
"I just want to play baseball. It doesn't matter where I'm at," Young said. "Of course I wanted to get out there, especially today. Everything happens for a reason. It's OK. I'm just happy it's just a headache right now and nothing more serious than that."
Said manager Terry Collins: "He was dizzy. That's why I didn't play him. We took him to the hospital. Everything was clean. But he said he was a little foggy."