Tether holds 11 per cent in Juve and have been frustrated being sidelined from the key decision-making.
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Tether chief exec Paul Iordino posted to X: : "Today, Tether has sent an official proposal to Exor to purchase their entire stake in Juventus.
"From the beginning, our goal has always been to support the team and restore it to the glory it deserves.
"As part of our commitment, if this transaction goes through, Tether will invest €1 billion in the club."
However, Exor - Juve's holding company - is insisting they won't consider selling.
A spokesman said: "Negotiations regarding the sale of a stake in Juventus are not underway."