A canoeist who has been banned after admitting that he doped a fellow competitor's drink, contrived a variety of schemes to rattle his rival, an official source said Thursday.

Yasuhiro Suzuki, a 32-year-old athlete who has already admitted secretly adding a banned substance to a drink consumed by 25-year-old rival Seiji Komatsu last September, also took his rival's passport and cash, and defamed him in emails. Suzuki has already apologized to Komatsu in writing.

Suzuki has been banned from competition by the Japan Anti-Doping Agency, while the Japan Canoe Federation has said it would seek a permanent ban.