The person spoke on condition of anonymity because the team's movements hadn't been announced.
MLB Network, and others, reported that the latest postponement was the game between the Brewers and Cardinals.
Louis Cardinals have multiple positive COVID-19 tests within the organization, and their game tonight with the Brewers has been postponed.
First pitch was slated for 1:10 p.m.at Miller Park.
The Miami Marlins and Philadelphia Phillies haven't played since Sunday because of an outbreak among Marlins players and staff. Miami has had 19 positive cases of coronavirus infections. ESPN's Jeff Passan confirmed the news, indicating that the Cardinals did have positive tests. As of Friday morning, it remains unclear how many individuals have tested positive.
The Philadelphia Phillies canceled their weekend games after staffers tested positive for the virus.
Major League Baseball officially postponed Friday's game.
"We fully support the measures taken by Major League Baseball regarding the postponement of games and will continue to update our fans as we receive additional information", the statement continued.
The Cardinals played in Minnesota on Tuesday and Wednesday before a scheduled day off Thursday. The Twins hosted Cleveland Thursday night, meaning the Indians likely used the same visiting clubhouse as St. Louis. Minnesota is scheduled to host the Indians again Friday night.