The Danish star suffered cardiac arrest during the match against Finland and had to undergo CPR.
Writing on Instagram alongside a photo of him smiling, Eriksen wrote: “Hello everyone.
“Many thanks for your sweet and amazing greetings and your messages from all over the world. It means a lot to me and my family.
“I’m fine – under the circumstances. I still have to take tests in the hospital, but I feel good.
“Now I will be cheering on the boys from Denmark in the next matches. Play for all of Denmark. Best, Christian. “
Eriksen was rushed to hospital on Saturday when he collapsed in the first half of the game against Finland, with his teammates forming a circle around him as he was treated by medics.
After the match was abandoned for around 90 minutes, Eriksen was able to message his teammates before they returned to the pitch to complete the match.
On Monday, he sent his first message through his agent, saying, “Thanks, I won’t give up. I feel better now – but I want to understand what happened, ”he said.
“I want to thank you all for what you have done for me.
Danish team doctor Morten Boesen said his medical results have so far been normal.
“The exams that have been taken so far look good,” Boesen said at a press conference.
“We don’t have an explanation as to why this happened. I cannot answer this question.
“I didn’t see it live, I saw it on screen when it happened. You saw the same as me. No explanation so far. “
Confirming that Ereiksen had suffered cardiac arrest, he added: “He was gone.
“We did cardiac resuscitation, it was cardiac arrest.
“How close were we to losing him?” I don’t know, but we got it back after a defib, so it’s pretty quick.
On the decision to end the game, he said: “I don’t think the right decision was to play the game.
“We had psychological help at the hotel last night. Everyone expressed their feelings and how they viewed the situation, and everyone was delighted that we did that and talked about it.
“We really appreciated the professional help we received from outside. “