* Guatemala may be banned by FIFA * Three players have life bans lifted (Adds reaction from Guatemalan federation) BERNE, March 14 (Reuters) - Guatemala have been warned they could be suspended by FIFA after three internationals, including two of the country's most-capped players, had life bans for match-fixing overturned. World soccer's ruling body said it had written to the Guatemalan football federation warning last week's decision by the Court of Honour of the Autonomous Sports Confederation of Guatemala (CDAG) constituted third-party interference in a sporting matter. ... More...