Mike Tyson is being sued for nearly $1.5m after his November bout with Jake Paul in Texas.
Medier says Tyson and Tyrannic broke a January pact.
Tyson allegedly terminated the partnership in March, the same day he publicized his bout with Paul, since Medier broke the agreement.
Medier's lawyers claim Tyson breached it and cost the firm €1.46m.
According to Medier's lawyers, "The true reason for Mr Tyson and Tyrannic's hasty and unlawful termination was because Mr Tyson had agreed a deal, sponsored by Netflix, to fight the influencer Jake Paul."
Tyson and Tyrannic have not responded to the case or issued a defense. On November 16, Paul defeated Tyson by unanimous decision at the AT&T Stadium in Arlington, Texas, in a highly anticipated and controversial boxing battle that viewers believed fell short.
After eight rounds, Paul won 80-72, 79-73, and 79-73 on points after bowing to Tyson and dropping his gloves before the final bell.