SHANGHAI (Reuters) - Chinese authorities visited a China office of German drugmaker Bayer AG <BAYGn.DE> in late August to investigate a potential case of unfair competition, the company said in an emailed statement on Friday.

The firm said it was "fully cooperating" with the Chinese authorities, but did not expand on the current stage of the investigation.

(Reporting by Adam Jourdan; Editing by Kazunori Takada)