Eight players and eleven members of the management staff have been affected.
The message came on Monday morning, just two days before Switzerland will face Sweden.
"More information will come during the day," they write.
The article is updated.
Stomach problems in Switzerland national team
2022-07-11T08:11:19.333Z
Sweden's next opponent in the European Championships, Switzerland, has canceled Monday's training at short notice. 19 people in the national team have had stomach problems, the association announces on Twitter.
Source: svt