A statement from JGR confirmed that Hamlin had been complaining of lower back pain and would be hospitalised overnight for observation. The team added that no further updates were expected to be issued overnight.
In the circumstances there was no comment from Hamlin's camp or JGR about the last-corner accident with Logano. Hamlin had sought to cool down the feud with his former team mate on Friday for bumping Logano into a spin last week at Bristol, which had taken the situation to a whole new level.
"I felt bad, and really if you could watch my in-car camera, you could see how frustrated I was to see he had damage to his car," Hamlin had told reporters. "I banged the steering wheel because I was, 'Man, I didn't mean to do that.'
"I wish the cameras would see what happened before the contact you saw on TV," he had continued. "That frustrates me the most. I'm not trying to bully Joey around because of performance.
"At the end of the race I shouldn't have degraded him as a driver," Hamlin added, calling his outburst "the big mistake" that he most regretted in the circumstances "It's not my job to say who's good or bad in our sport. That part probably should have been left out."
Hamlin might not think that's his job, but three-time Cup champion Tony Stewart does often feel that it falls to him to school the younger drivers in NASCAR etiquette when they're getting out of line, and on Sunday after the race he had his sights set on none other than Joey Logano.
The angry clash in pit road wasn't over the Hamlin incident, but about a restart 11 laps from the end in which Stewart had felt Logano deliberately blocked him. Insults, shoves and punches where thrown in the confrontation that ensued, although none of the latter reportedly connected.
“If he ever turns down across in front of me again, I don't care what lap it is, he won't make it through the other end of it,” said Stewart after the altercation, adding that if he hadn't hit the rev limiter on his car then Logano "wouldn't have made it through turn 1 to begin with" at the time.
“I'm tired of these guys doing that stuff, especially out of a kid that has been griping about everybody else and then he does that the next week," Stewart added. "It's time he learns a lesson."
Stewart continued, "He's run his mouth long enough. He sat there and done this double standard and he's nothing but a little rich kid that has never had to work in his life," adding: "He's going to learn what us working guys who had to work our way up how it works."