Brian Wall, premier of the Canadian province of Saskatchewan, said Sinochem’s planned purchase of Potash Corp (POT.NYSE, POT.TSX) would not be in Saskatchewan’s best interests, the Wall Street Journal reported. "If sovereign interests from China are somehow involved as this deal evolves … we would have a real concern about that," Wall said. According to sources close to the matter, Sinochem has already hired HSBC to advise the company ahead of a possible bid. Potash Corp has already turned down BHP Billiton’s (BHP.NYSE, BLT.LSE, BHP.ASX) US$38.6 billion offer to buy the fertilizer maker. A source close to Sinochem said potential Chinese bidders are still waiting for a green light from Beijing before making any official bid.