England faced Spain recently, and despite the Red Devils' goalkeeper being in good form throughout the game, all the eyes were on Shaw, who suffered a horrific injury through a clash of heads with Carvajal.
Following the Saturday injury, fans around the world took to social media to send Shaw goodwill messages as he reworks his journey back to fitness.
The 23-year-old will miss England's worldwide game versus Switzerland on Tuesday, and is set to return to his club for further test.
Shaw later tweeted on Saturday evening: "Thank you for all the love and support I am doing fine and am in the best hands".
England coach Gareth Southgate says the defender will follow concussion protocols and be inactive for seven days "but he should be back in the fold as soon as that's done".
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Shaw appeared to have struck his head against Carvajal's body, forcing him down to the ground where he received treatment, including oxygen. "He's talking and seems fairly comfortable", Southgate said.
Shaw was making his first England start since facing Switzerland in September 2015, a week before his double leg break in a Champions League match while playing for Manchester United. Good sign after what looked to be a very scary fall.
"We'll go through some tests".
Shaw's absence comes as a huge blow to the defender, who had started the season in impressive fashion for United.
The youngster has been in inspired form this campaign, and his good run at United earned him an England call up - two things that were seemingly impossible a year ago.