Mets first baseman Jared Young was hospitalized Thursday after a terrifying collision at first base.

Young was covering the bag in the sixth inning against the Phillies when Justin Crawford hit a slow roller toward first, creating confusion over whether Young or pitcher Nolan McLean would field it.

McLean's right knee slammed into Young's head as both players converged on the ball, knocking Young to the dirt.

He lay motionless as Mets trainers rushed to his side, eventually getting carted off the field. Young flashed a thumbs-up to the crowd as he left, a sign he'd regained consciousness.

"It was scary, man," shortstop Francisco Lindor said after the Mets' 3-0 loss. "It was scary to sit there and just know that he wasn't with us in that moment. He was just somewhere else."

"That was a terrifying moment on a baseball field," interim manager Andy Green added.

Why McLean's own reaction says so much about the moment

A CT scan at the hospital came back negative. Young was showing concussion symptoms Thursday evening but had full use of his extremities.

"Thankful he is showing really good signs right now and doing well at the hospital," Green said. "And thankful for the paramedics and everybody that came onto the field so quickly to take care of him."

McLean actually stayed in the game after the collision, striking out Garrett Stubbs to end the inning before Green pulled him.

"He knew it was a really bad collision and still was willing to go back out the next inning," Green said. "I didn't feel that that was in his best interest at that point in time."

"He's a heck of a person, a great competitor. But the humanity hit him pretty hard there, too."

McLean declined to speak with reporters afterward, too emotional following the incident.

Young, 31, has quietly been one of the Mets' better stories this season, hitting .266 with a .759 OPS across 103 games in a first-base platoon role.

He's played across three MLB organizations, in Korea, the Dominican Republic, and for Team Canada in the World Baseball Classic.

"He's a guy that's always happy," Lindor said. "He's somebody that we all respect and appreciate. I can only imagine what he's going through right now, his family, as well."

Mark Vientos replaced Young defensively and finished 1-for-2, part of a Mets infield now reshuffling around his absence.

"Life is bigger than this game, for sure," Lindor said. "Seeing him like that, not reacting, and then seeing the trainer holding his neck, it's scary. You can only think about how quick life can get out of your hands."