LeSean McCoy isn't the only NFL player under investigation for allegedly attacking off-duty cops in Philly -- investigators say the other 3 men are also pro football players.
The Philadelphia PD issued a statement saying all of the suspects "are reported to be members of the National Football League."
Cops have not yet released the names of the suspects.
The Philly PD says the fight was over "the ownership of a bottle of champagne" -- with the suspects allegedly punching, kicking and stomping the victims multiple times.
The victims were hurt pretty badly -- cops say one man transported himself to the hospital where he was treated for a cut over his right eye, broken nose, broken ribs and a sprained thumb.
Another alleged victim says he needed 8 stitches to close a gash on his left eye and may have a skull fracture.
Story developing ...