The ex-Baltimore Ravens tackle spelled out the eyebrow-raising claims in a petition filed in Shelby County, Tenn. on Monday ... alleging Sean and Leigh Anne Tuohy "exploited" him "for their own benefit" after realizing he was a "gullible young man" with athletic talent.

Oher says he initially got involved with the Tuohys during the summer following his junior year of high school ... after he claimed "a broken social system" in Tennessee left him homeless and in need of aid.

In the docs, Oher says the couple invited him to stay in their home often during that summer to help him out, and took him on shopping trips where they'd buy him clothes. Eventually, before his senior year started, he says they asked him to move in with them.

"The Tuohys did tell Michael they loved him and that they intended to legally adopt him," Oher said in the documents. "Michael believed them, was delighted to be part of a real and stable family, and trusted Mr. and Mrs. Tuohy completely."

A short time later, however, Oher says the Tuohys pulled one over on him.

In the docs, the former football player -- who's now 37 years old -- claims the Tuohys presented him with legal papers that he believed were needed to begin the process of the family adopting him. Instead, however, he says he just learned in February 2023 that they were actually a petition to appoint them as his conservators -- a filing that would allow the Tuohys to "have total control over Michael Oher's ability to negotiate for or enter any contract, despite the fact he was over 18 years of age and had no diagnosed physical or psychological disabilities."

Oher claims the conservatorship then allowed the Tuohys to negotiate a deal with Fox for "The Blind Side," the '09 flick based on Oher's life.

Oher says the Tuohys got themselves and their kids -- but not him -- "a contract price of $225,0000 plus 2.5% of all future 'defined net proceeds.'" The movie -- in which Sandra Bullock won an Oscar for her portrayal of Leigh Anne Tuohy -- ended up grossing over $300 million.

Oher claims as part of the deal with Fox, a contract giving away the rights to his story without any form of payment whatsoever, was signed. Oher says he "at no time ever willingly or knowingly signed this document and that nobody" ever made him aware of what the document actually entailed.

Oher is asking for a judge to end the conservatorship. He's also asking for damages ... as well as an accounting of the money the Touhys made through contracts negotiated on his behalf. It all appears to be potentially a precursor to a lawsuit.

Oher -- who's previously been critical of "The Blind Side" over the way he feels he was wrongly portrayed as dumb -- played in the NFL from 2009 to 2016 ... starting 110 games in his career.