Christian Eriksen was awake at a hospital and stabilized after he collapsed on the pitch during the first half of Denmark's match against Finland.
"We have spoken to Christian Eriksen, who has sent his greetings to his teammates. His condition is stable, and he continues to be hospitalized for further examination," wrote the Danish federation in a statement.
Danish football federation director Peter Moeller said Eriksen got a "heart massage" while being treated on the field.
"He fell over and got help and heart massage on the field," Moeller told Danish public broadcaster DR. "He was fortunately awake when he left stadium."