In a new book about New England Patriots coach Bill Belichick's life, an anonymous source claims that quarterback Tom Brady has "had enough" of the coach and would "divorce" Belichick if he could.

ESPN published excerpts of the book — which is titled "Belichick: The Making of the Greatest Football Coach of All Time" and authored by ESPN reporter Ian O'Connor — on Tuesday night.

According to the network's story, the book paints Brady as a man who "felt trapped" with his longtime coach this offseason amid the previously-reported discord between them.

"Tom knows Bill is the best coach in the league, but he's had enough of him," the anonymous source with knowledge of the relationship told O'Connor in the book. "If Tom could, I think he would divorce him."

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O'Connor interviewed 350 people for the book, according to ESPN, but Belichick did not cooperate.

“ ‘Cause I don’t have anything to do with it,” Belichick said when asked why he didn’t participate in the biography. “I’m focused right now on Detroit and the 2018 season. I’m going to try to do a good job with that.”

The friction between Brady and Belichick became a significant story line last year, with part of it revolving around Brady's personal trainer, Alex Guerrero. The Boston Globe reported late last season that some of Guerrero's privileges, which had been extensive given his close relationship with Brady, were revoked by Belichick.

Less than a month later, ESPN published a story further detailing the conflict, and other tension between key figures in New England, with the headline: "For Kraft, Brady and Belichick, is this the beginning of the end?"

Brady spoke about his relationship with Belichick at length during a conversation with broadcaster Jim Gray at a conference over the offseason. When asked if he feels appreciated by his coach, Brady joked, "I plead the Fifth!" But he also said Belichick is "the best for me" and praised his ability.

"He has a management style (with) players, and he would say, 'Look, I'm not the easiest coach to play for.' And I agree. He's not the easiest coach to play for," Brady said at the Milken Institute Global Conference in California on April 30.

"But he's the best for me. I think what he's proven is that whatever talent he has, he maximizes talent. What more could you ask of a coach than that? That's what I want as a player."

Contact Tom Schad at tschad@usatoday.com or on Twitter @Tom_Schad.