Captains of several European teams had planned to wear the rainbow-themed armband as part of a campaign for diversity during the tournament hosted by Qatar, but they have backed down over the threat of FIFA disciplinary action.They combined this with massive threats of sports sanctions without specifying what these would be," DFB spokesman Steffen Simon told AFP's sports subsidiary SID.The Lausanne-based international sports court said however that the case should first be put to a FIFA appeal commission.German fans have been vocal about their opposition to Qatar as a host for the World Cup, with supporters of several high-profile Bundesliga clubs including Bayern Munich and Borussia Dortmund urging boycotts.Earlier Tuesday, major German supermarket chain REWE said it was ending its partnership with the German football association with immediate effect over what it described as FIFA's "scandalous attitude" in the escalating row over diversity."