The Giants found the Steelers were using deflated footballs during last Sunday 's 24 - 14 loss in Pittsburgh .
Giants informed the NFL , a person with knowledge of the situation told NJ Advance Media on condition of anonymity .
The Giants found the Steelers were using deflated footballs during last Sunday 's 24 - 14 loss in Pittsburgh , and they informed the NFL , a person with knowledge of the situation told NJ Advance Media on condition of anonymity .