By Alan Baldwin and Ian RansomLONDON, July 30 (Reuters) - European soccer's governing body UEFA and its 55 member nations on Thursday voted to boycott all FIFA tournaments in what could be a knockout blow to the global soccer organisation's proposal to sell a stake in the World Cup to external investors.In a statement that pulled no punches, Europe presented a united front to FIFA boss Gianni Infantino, whose proposal has caused uproar only weeks after the World Cup was held in the United States, Canada and Mexico.

Europe’s football governing body said the tournament should not be seen as an investment product and is 'not for sale'.

The Union of European Football Associations (UEFA) has threatened to boycott all competitions organised by the Fédération Internationale de Football Association (FIFA), including…