Decatur police said in a statement Thursday that Biddle was shot Sunday night outside a residence and was treated and released from a local hospital. Police said there was no evidence Biddle caused or provoked the shooting.
The shooting was first reported by The Huntsville Times newspaper.
The 25-year-old Biddle grew up in Decatur and played college football at the University of Mississippi.
Police have not made any arrests in the case and have not released a possible motive for the shooting.
Biddle was promoted from the Giants' practice squad after receiver Plaxico Burress accidentally shot himself in the leg last November.
New York Daily News blogger Ralph Vacchiano notes that " This, of course, is the third incident involving a Giants receiver and a gun in the last two months. On Nov. 25, Giants receiver Steve Smith was robbed at gunpoint outside of his Clifton, N.J. home. Three days later, Giants receiver Plaxico Burress accidentally shot himself in the thigh in a Manhattan nightclub."