Chansiri's family controls the Thai Union Group, the world's largest producer of canned tuna. In January 2015, a consortium led by Chansiri acquired a 100% stake in Sheffield Wednesday from Milan Mandaric for £37.5m and targeted promotion to the Premier League by 2017.
During the summer of 2015, Chansiri changed many aspects of the Sheffield Wednesday set-up including the backroom staff and players, such as sacking manager Stuart Gray and replacing him with Carlos Carvalhal, who had previously managed Turkish side Besiktas and several clubs in his home country of Portugal.
- "Sheffield Wednesday: Thai group buys Championship club". BBC Sport. Retrieved 29 January 2015.
- "Sky Bet Championship: Thai consortium complete Sheffield Wednesday takeover". Skysports.com. Retrieved 29 January 2015.
- Sheffield Wednesday BBC sport: Dejphon Chansiri targets Premier League, March 2, 2015
- "Carvalhal named Owls head coach". BBC. Retrieved 2015-11-02.