His 12-strong entourage, however, tested negative and will return in a separate plane.
Public Health Minister Anutin Charnvirakul made the announcement on Wednesday at the Bamrasnaradura Infectious Diseases Institute, where the patient has been put up. Anutin also said the European minister has been treated with Favipiravir and will return home later in the day.
The minister was reportedly scheduled to meet Prime Minister Prayut Chan-o-cha and other ministers on Wednesday, but the mission was cancelled after he was found to be infected.