 Bilos started his career at lower league team Sportivo Pergamino in 1999, but was soon picked up by Banfield.He played for them for four years, including the Copa Libertadores 2005 before making the move to Argentine giants Boca Juniors on July 2005.At Boca he won several titles including Apertura 2005, Clausura 2006 and Copa Sudamericana 2005.