The centre-back responded to the crisis, as Eriksen fell unconscious to the ground in the final minutes of the first half between Denmark and Finland in the Euro 2020 opener.
The Group B match was postponed but later completed, as Eriksen called his teammates from the hospital bed.
Kjaer has been praised for his actions in the heat of the moment, as he rushed to help his friend and teammate.
Reports reveals the Denmark captain stopped Eriksen from swallowing his tongue, then put him in the recovery position and started CPR before the medical staff arrived at the scene.
Kjaer was then seen comforting Eriksen’s partner, who came down to the pitch.
Eriksen’s teammate at Inter, Nicoló Barella, gave a shoutout to the defender playing for their local rivals.
“Beyond the colours, compliments Simon,” Barella wrote in a story on Instagram. “True captain and a real man.”
Kjaer was also praised on social media by fans and journalists.
Captain and hero: Simon Kjaer.
Before the medics got there he secured his neck, cleared the airways and started CPR. Could have saved #Eriksen’s life. Act of heroism.
Kjaer trying to keep also Cristian’s wife strong, is very emotional.
What a man. 💪
So proud of you 🙏♥️ pic.twitter.com/eOFOMksODe
— Angelo Mangiante (@angelomangiante) June 12, 2021
We’ve to say thanks again to the medical staff.
We talk a lot about football and ‘stupid’ things here… but they’re HEROES. Today as every single day.
Also, thanks to all Denmark players – and in particular to Simon Kjaer. This is the meaning of TEAM.
Stay strong, Chris ❤️🇩🇰
— Fabrizio Romano (@FabrizioRomano) June 12, 2021