Manager Aaron Boone said Tanaka will go into the concussion protocol after his CT scan came back negative, according to Bryan Hoch of MLB.com.
A scary scene played out at Yankee Stadium as Tanaka remained motionless on the ground for several minutes after a line drive off the bat of Giancarlo Stanton hit him.
The pitcher was helped off the field and into the dugout following the play.
"It's definitely horrible," Montgomery said when asked about Tanaka's injury, according to Bryan Hoch of MLB.com. "I'm just thinking and praying for him right now. I hope that he's OK."
Tanaka posted a 4.45 ERA across 182 innings for New York in 2019. The two-time All-Star was expected to slot in behind Gerrit Cole and James Paxton in the Yankees' rotation to start the 2020 campaign.