NEW YORK (AP) — Major League Baseball has opened a formal investigation into illegal gambling and theft allegations involving Los Angeles Dodgers star Shohei Ohtani and his interpreter, Ippei Mizuhara.

Mizuhara was let go from the team Wednesday following reports from the Los Angeles Times and ESPN about his alleged ties to an illegal bookmaker and claims from Ohtani’s attorneys that the two-way Japanese star had been the victim of a “massive theft.”

Ohtani and the Dodgers were in Seoul, South Korea, for their opening series against the San Diego Padres when reports were published about alleged ties between the 39-year-old Mizuhara and an illegal bookmaker.