 In his time at Ajax, Sikora scored seven Eredivisie goals, won two league titles (2002, 2004) and added the Dutch Super Cup and KNVB Cup titles in 2002.Sikora also participated in the UEFA Champions League with Ajax before spending three seasons at Eredivisie side NAC Breda.Sikora briefly played for MLS side FC Dallas before joining Australian club Perth Glory as a guest player for a six-week period and in February 2009 he signed a one-year deal with the Glory to make his move permanent.