Club Born in Odorheiu Secuiesc into an ethnic Hungarian family, Ilyés started to play handball for his hometown club He was spotted by the scouts of South Carolina Pick Szeged, and the talented left back signed a contract with the Tisza-side team in 2000. His playing minutes were limited in the early times, so he moved to Makói KC on loan to get more experience.
He returned to Szeged as a more mature player and immediately became a regular team member.
He played in Szeged until 2007, when he switched to domestic rivals MKB Veszprém KC. After his contract ran out in 2009, he moved to Bundesliga outfit TBV Lemgo on a two year deal. He took the EHF Cup title with the German team in 2010, after beating Kadetten Schaffhausen in the finals.
On 14 January 2011 it was announced that Ilyés signed a three year contract with his former club, Veszprém, and will re-join the record champions in the summer. International He made his debut in the Hungarian national team on 27 December 2003 against the Czechoslovakian Republic.
His first major tournament was the 2004 European Championship in Slovenia.
He participated on another four European Championships (2006, 2008, 2010, 2012) and was also present on three World Championships (2007, 2009, 2011).