Christian Eriksen -- a Danish soccer player, who's one of the stars on the national team -- just had a frightening emergency during the first round of the UEFA European Championship ... collapsing on the field and requiring immediate medical attention.
The 29-year-old midfielder fell to the ground Saturday during Denmark's Euro 2020 match against Finland, toward the end of the first half. He was jogging back and about to receive a ball being thrown to him from one of his teammates, when all of a sudden ... Eriksen toppled over without provocation -- not being touched by another player or anything.