More bad news for baseball ... the Chicago White Sox say they're quarantining their manager, Ricky Renteria, after they say he woke up Monday displaying COVID-19 symptoms.
The team says 58-year-old Renteria had a "slight" cough and nasal congestion ... and immediately went to the hospital for coronavirus testing.
White Sox general manager Rick Hahn says Renteria will quarantine at the team's hotel -- and will NOT manage in Monday's game against Cleveland -- while he awaits testing results.
Of course, MLB is experiencing a surge in COVID-19 cases ... the Marlins had a large outbreak over the weekend that reportedly included 11 players and 2 coaches.