Ruben Anton Zadkovich (, ; born 23 May 1986) is an Australian former professional soccer player, and manager of Perth Glory. He played for six clubs in a career that spanned between England and Australia, notably becoming a crowd favourite at Newcastle Jets FC in the A-League. Zadkovich was also capped for Australia, representing the Socceroos on three occasions. Club career Born in Fairfield, Sydney, New South Wales, Zadkovich had previously played for English Football League club Notts County, scoring on his debut against Chester City, as well as Queens Park Rangers and Australian side Wollongong Wolves. He has also made several appearances for the Young Socceroos, most notably at the FIFA World Youth Championship. Sydney FC Following his time in England, Zadkovich returned to Australia in late 2005 and trialled for Sydney FC. He travelled with the squad to the FIFA Club World Championship and despite not making an appearance he impressed coach Littbarski, being called in as a short-term replacement for injured Ufuk Talay late in the season. After a 12-minute debut off the bench against Queensland Roar, Zadkovich impressed with his first start against Perth Glory (which included a goal), playing one game in Sydney's run to the inaugural A-League championship, earning him a two-year full-time contract. He was allowed to leave the club in March 2008. Derby County On 17 April 2008, it was revealed Zadkovich had signed a two-year deal with English club Derby County, although his registration was unable to be completed before 1 July. Zadkovich made his Derby debut as a second-half substitute against Norwich City at Pride Park in October 2008, in a match which Derby won 3–1. He struggled with injuries during his time at Derby and, after only 7 appearances for the club, cancelled his contract by mutual consent on 23 January 2010. Newcastle Jets On 6 April 2010, Zadkovich confirmed that he had penned a three-year contract with the Newcastle Jets that would see him return to play his football in Australia. Zadkovich played 97 games over four seasons with the Jets. He was appointed captain in his third season and led the team until he was recruited by Perth Glory in 2014. Perth Glory On 29 May 2014, Zadkovich received an early release from Newcastle Jets and signed with Perth Glory. On 15 November 2014, Zadkovich made his debut for Perth Glory coming on as a substitute against