Saquon Barkley ACCIDENTALLY gave away a game ball from his record-setting Sunday Night Football performance against the Rams ... but, this story has a happy ending!
TMZ Sports has learned Barkley got the pigskin back.
Here's the deal ... en route to their 37-20 win over the LAR, Philly's big free agent acquisition set not only an Eagles single-game rushing record, but also a career-high with 255 yards rushing yards.
In the heat of the moment ... Barkley threw the game ball to a fan in the stands -- only realizing the mistake he made when he got back to the sideline.