That Shaw is already driving his vehicle - something concussion recipients are normally advise against doing - shows he is already making solid progress and that, crucially, the injury was nothing serious.
The leftback looked like he may have suffered another major injury minutes into the second half on Saturday, with his head appearing to hit Dani Carvajal's hip before sickeningly bouncing off the turf.
The Real Madrid right-back requested Shaw's mobile number from his global team-mate to check on his condition after he had to be taken off on a stretcher following several minutes of treatment from medical staff. And now, he will undergo further tests at Wembley to know the seriousness of the injury.
He tweeted: "Thank you for all the love and support I am doing fine and am in the best hands".
Luke Shaw had impressed before injury
"I chose to spend mine back at home, to make sure that I'm feeling fully charged ahead of the games that are coming up soon".
"He's sat up in the dressing room talking and seems fairly comfortable", said Southgate. "We'll have to assess him a bit more, but that's definitely a good sign".
The Manchester United left-back took to Twitter to reassure England fans of his condition following the game.
Gray comes in for Marcus Rashford who picked up a knock in the 2-1 defeat at Wembley Stadium on Saturday. He's still. we have quite a few players short of minutes and sharpness, so to come into a game like tonight after so long out of the global scene is as tough a test as you can have.More news: Swimsuit-less Miss America pageant is under way