Saquon Barkley might've just saved a teenager's relationship with his ex-girlfriend ... all by putting his John Hancock on a poster.
For real.
Here's the deal ... Kareem Reyad went out to New York Giants practice Thursday at Quest Diagnostics Training Center in New Jersey to urge the 26-year-old running back to help him get his girl back after the two had split late last year.
Wearing a No. 26 Barkley jersey, Reyad wrote on a sign, "Saquon my ex will take me back if you sign this" ... and he flashed it throughout the NYG workout.