Graham James Arnold (born 3 August 1963) is an Australian soccer manager and former player. Arnold was appointed to work as an assistant coach of the Australian national soccer team in 2000. After head coach Frank Farina was sacked in 2005, Arnold worked with Guus Hiddink for the 2006 FIFA World Cup campaign, in which they made the second round of the finals. After Hiddink left, he became interim coach of the Socceroos. Arnold went on to qualify Australia's U23 men's national soccer team (nicknamed the Olyroos) for the 2008 Beijing Olympics. Arnold then went on to assist Pim Verbeek for qualification of the 2010 World Cup in South Africa. Arnold went on take the manager role at A-League club the Central Coast Mariners between 2010 and 2013, where he guided the club to a Premiership and a C