DETROIT (AP) — A doubleheader between the St. Louis Cardinals and Detroit Tigers this week is being postponed to allow more time for additional COVID-19 testing.

Major League Baseball opted to postpone Thursday’s doubleheader to continue additional testing while players and staff are quarantined before the team returns to play. More details about the Cardinals’ resumption of play will be announced later this week.

The Cardinals had a series against Pittsburgh set to start on Monday postponed after a weekend series against the Cubs was scrapped due to three positive coronavirus tests.

St. Louis had two more players and a staff member test positive for the virus on Friday and have had eight positive players overall, including star catcher Yadier Molina.

There have now been 29 games postponed by Major League Baseball because of coronavirus concerns. The Cardinals have not played since July 30 and have had 15 games scrapped.

Miami and Philadelphia each had seven games postponed earlier before returning to the field.