Ludicrous idea from Sean Payton ... the New Orleans head coach wants to test and quarantine 50,000 (!!!) Saints fans so they can safely pack the Superdome for N.O.'s playoff game this weekend.
For real.
The 57-year-old former Super Bowl champ made the revelation on a phone call with reporters Wednesday ... saying he's dead serious about making a virus-free playoff game in Louisiana on Sunday.
"I've brought up the idea of testing 50,000 people and quarantining them in a hotel and having like the most safest Superdome known to man, scientifically,” Payton said.