Hanson informed the Braves that he blew a tire and might have hit his head when his car went off the road a little after 7 a.m. ET. The 25-year-old pitcher arrived at ESPN's Wide World of Sports complex a short time later and began preparing for the first workout of the year for Atlanta's pitchers and catchers.
After sitting through manager Fredi Gonzalez's meeting at 9:30 a.m., Hanson informed members of the medical staff that he was not feeling right. Braves trainer Jeff Porter sent the right-handed pitcher to an area doctor to determine whether he suffered a concussion.
"We've just got to do some preliminary checks on him," Gonzalez said. "I don't see anything that is going to be glaring. He bumped his head. He doesn't know whether it was on the glass or the steering wheel or something."
The Braves had not received any updates as of early Monday afternoon. Hanson did not have any noticeable bruises or scrapes.
"From what I understand, there was no police report or anything," Gonzalez said. "He just came around the corner a little bit too hot."
Gonzalez said he thought Hanson could participate in Tuesday's workout if he did not suffer a concussion.
Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.