He will meet with a facial specialist "to determine next steps."
Pillar exited Monday's game in the seventh inning after a scary scene unfolded during the seventh inning.
After the game, Pillar let it be known that he's "doing fine" while also pointing out his HBP led to the game-winning run:
While Pillar is in good spirits, New York manager Luis Rojas said Pillar was taken to the hospital, where he underwent a CT scan:
Despite this setback, Pillar has been fairly durable and appeared in at least 142 games in five straight seasons from 2015 through 2019.
The outfielder was solid at the plate in the shortened 2020 campaign and slashed .288/.336/.462 with six home runs and 26 RBI while splitting time between the Boston Red Sox and Colorado Rockies. He also drilled a career-best 21 long balls in 2019 for the Toronto Blue Jays and San Francisco Giants.
Pillar is best known for his defense and is responsible for 53 total defensive runs saved above average in his career, per FanGraphs.
With Brandon Nimmo and Albert Almora Jr. on the injured list, the Mets turned toward Khalil Lee as a replacement for Pillar in Monday's game.