The NFL on Wednesday confirmed the fine for "unauthorized apparel."
Griffin was inactive for the game because of a sprained knee, and he wore an Adidas T-shirt and sweat jacket when he addressed reporters afterward. Griffin has a sponsorship deal with Adidas, but the league has a deal with Nike.
It's the second time this season Griffin has been rebuked for his attire, but it's his first time he's been fined. He covered up the Nike swoosh on his official team warm-up shirt before the regular opener against the New Orleans Saints.