Christian Eriksen said he is feeling "okay" and thanked supporters after he collapsed on the pitch during Denmark's Euro 2020 opener against Finland on Saturday.
The 29-year-old Inter midfielder had to be resuscitated on the pitch when he fell to the ground just before half-time in the Group B fixture.
Eriksen is said to be in a stable condition.
England hit with Wembley ban after crowd trouble at Euro 2020 final
His agent Martin Schoots told Gazetta dello Sport on Monday he had spoken to the Inter Milan midfielder and that he was "in good form" and "making jokes".
Now, Eriksen has spoken publicly for the first time since the horrific incident.
"Hello everyone, big thanks for your sweet and amazing greetings and messages from all around the world," he wrote in a message published on the Denmark National Team's Twitter account.
"It means a lot to me and my family. I'm fine - under the circumstances. I still have to go through some examinations at the hospital, but I feel okay.
"Now, I will cheer on the boys on the Denmark team in the next matches. Play for all of Denmark."
Former Denmark goalkeeper Peter Schmeichel felt it was "absolutely ridiculous" that the game restarted later on Saturday.
His son and the national team's number one goalkeeper Kasper said the horrible moment could spur the team on to great things this tournament despite the opening day loss.
"We're still in the tournament," the Leicester City player said.
"Now we have to try to see if we can win this and do it for Christian and do it for all the fans who sat with us and were just as powerless in the situation as we were.
"I have no doubt that this team has the unity, the strength to be able to come together and go out and do something special."
Denmark next face Belgium on Thursday.
Schmeichel critical of UEFA's ''heat of the moment'' restart decision following Eriksen incident
Twitter reveals scale of racism in UK after England Euro 2020 final defeat
'I knew straight away' - Referee on Eriksen's Euro 2020 collapse