The league has been hit hard with the virus over the past week ... as the Miami Heat, Boston Celtics, Dallas Mavericks and more have been struggling to put enough men on the court due to the NBA's Health and Safety protocols.

Fresh off the Heat's matchup with the Celtics being postponed Sunday, the Association has now pushed back 2 more games -- Mavs vs. New Orleans Pelicans and Celtics vs. the Chicago Bulls.

Of course, the league requires an 8-man roster in order to compete ... and the Heat and Mavs have been unable to fit that requirement as they conduct contact tracing following positive or inconclusive tests within their organizations.

The Philadelphia 76ers have also dealt with COVID-related issues after Seth Curry tested positive last week.

Despite the mess, the league officials say they will NOT postpone the season ... as they anticipated some hiccups along the way.