By Brian Homewood ST PETERSBURG (Reuters) - FIFA will meet its leading commercial partners next month after three of them increased pressure for major reforms to soccer's governing body following a series of corruption scandals. FIFA Secretary General Jerome Valcke said that Coca-Cola, Visa and McDonald's had written asking for information about what was being done to clean up governance of the sport. "Clearly, there were a number of sponsors, mainly three, its Coca-Cola, McDonald's and Visa, who have expressed and sent a letter to FIFA, asking for information," he told a new conference in the Russian city of St Petersburg. More...