Nyon, Aug. 4 -- European football body UEFA has threatened FIFA with legal action over Gianni Infantino's failed plan to sell a stake in future World Cup profits to private investors, and said any potential evidence should not be destroyed. Infantino's secretive proposal to raise $4.2 billion from investors including the New York investment firm of Joshua Kushner was dropped early Saturday, days after the revelation in media reports provoked a global furore. UEFA led the backlash and on Thursday its 55 member federations met to agree boycotting all FIFA events and competitions while the proposal was active. Now lawyers for UEFA have informed FIFA that the European body is "actively considering legal action, arbitration, and/or regulatory complaints ... arising out of and in connection with the FFE (FIFA Forward Enterprise) plan proposed by FIFA and all related matters." The letter dated Friday from the legal firm Dechert in New York was seen on Monday by The Associated Press. The letter named 18 FIFA executives who it said should retain data, documents and electronic messages as potential evidence. They include Infantino, chief finance officer Thomas Peyer and Arsene Wenger, who is FIFA's head of football development....