Antonio Brown is calling BS on his former chef ... saying he did NOT submit a fake COVID vaccine card to the NFL.
The chef, Steven Ruiz, told the Tampa Bay Times Brown sought and then obtained the fraudulent paper back in July ... but a rep for Brown says it's just flat-out not true.
In a statement to NFL Network's Ian Rapoport, Brown's attorney, Sean Burstyn, said the Tampa Bay Buccaneers receiver is, in fact, vaccinated -- and does, in fact, have valid paperwork.