The 31-year-old right-hander immediately fell to the ground and came to rest before leaving the field with the help of Yankees medical staff.
Tanaka was taken to New York-Presbyterian Hospital for further assessment, but has since been released and subjected to the concussion protocol. A scanner came back negative, said manager Aaron Boone.
“I appreciate all the support,” Tanaka wrote on Twitter on Saturday evening. “I feel it a little bit right now, but I’m fine. Will try to get back on the mound as soon as possible! Thank you again for all these encouraging words! ”
Saturday marked the official start of spring training 2.0. The opening day is scheduled to take place later this month.