Madrid, Apr 13 (EFE).- Real Madrid assistant coach Aitor Karanka had a word of warning for those who think Los Blancos are a shoo-in to reach the Champions League finals. Borussia Dortmund, their semi-final rival who Real has failed to beat in two tries this year, are dangerous, Karanka says. br br EFE TV - MADRID - 15:44 GMT br br Keywords: efe-football-soccer-athletic-bilbao-real-madrid-liga-karanka br br Tel: +34 913 467 200. br br E-mail: tvefe@efe.es br br Web: www.efeservicios.com br br br br © EFE 2013. Está expresamente prohibida la redistribución y la redifusión de todo o parte de los contenidos de los servicios de Efe, sin previo y expreso consentimiento de la Agencia EFE S.A.