TENNESSEE. (THECOUNT) — Titans O-lineman Taylor Lewan hammered tears in a newly released video while admitting he tested positive for an illegal substance.

Lewan claims he “accidentally” ingested a banned substance that TMZSports say could lead to an NFL suspension.

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Lewan — Tennessee’s 3-time Pro Bowl left tackle — is facing a 4-game ban after the NFL says he tested positive for ostarine — a substance that essentially works like anabolic steroids.

Lewan made a video to explain the situation … and adamantly says that while he did NOT knowingly take the substance — he is responsible for it getting into his body.

“I want everybody to know that I’ve never taken this supplement knowingly and I’ve never cheated the game and I never will.”

Lewan says he even took a polygraph test — which he says he passed (and promised to share later on social media) — to prove he didn’t purposely take the drug.

Taylor then began apologizing to his team, and that’s when he got emotional … breaking down in tears.

DEVELOPING::

Watch the video on TMZ.