In March, Zlatan Ibrahimovic was back in the Swedish national team after a six-year absence.
But his national team game may be contrary to Fifa and UEFA's ethical rules, something that Aftonbladet was the first to report on.
This is because the Swedish star is a partner in a gaming company.
Uefa now confirms that they have started an investigation into Zlatan Ibrahimovic's involvement in the gaming company.
Uefa writes on its website that it has started an investigation into violations of section 31.4 of their disciplinary rules.
It is also written that further information will be available during the course of the investigation.
According to the regulations, those who violate this can be punished with a fine of approximately one million kronor and suspension from all forms of football-related activities.
The text is updated.