West Germany’s 1974 World Cup winner Günter Netzer is being called as a witness in the trial of three former German Football Federation (DFB) officials accused of tax evasion linked to the 2006 World Cup. The regional court in Frankfurt confirmed to dpa on Wednesday that the 79-year-old has been summoned to appear on May 23. The trial concerns a payment of €6.7 million ($7.3 million) that the DFB transferred to FIFA in April 2005. Theo Zwanziger, Wolfgang Niersbach and Horst R. Schmidt are accused by prosecutors of wrongly including the sum in a tax return for 2006 as a business expense. The m…