The NASCAR legend appeared to grab too much kerb at the Turn 5 right-hander, and bounced nose-first into the tyre wall on corner exit, his right hand still holding the steering wheel.
The incident brought out the red flag, and Johnson initially told NBC that his hand was fine.
However, the IndyCar sophomore was unable to take part in the fans’ autograph session due to a huge splint on his right forearm.
He took to social media to apologise for his absence and to explain he was heading for further examinations.
“Hey everybody, as you can see I’m a little banged up and have a splint on,” said the 46-year-old, who scored his best IndyCar result to date with sixth last time out at Texas.
“First and foremost, apologies to the fans at the autograph session that I wasn’t able to attend. I’d already got something else going on here [pointing to sore arm].
“I’m on my way to be further evaluated, just to get a good honest look and understand what my options are.
“We really…
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