Okon grew up in a Sydney suburb of Bossley Park. He is of German and Italian descent. He represented his high school, Patrician Brothers' College, Fairfield during his time as a teenage schoolboy and featured prominently in all teams including the A Grade squad. However, his abilities did not stop at the football pitch. He set the record for high jump at the College's annual Athletics Carnival in the under 16s age group which was not broken until 2004. Okon left Marconi Stallions in 1991 for Club Brugge, and due to a series of excellent performances at sweeper won the Belgian Golden Shoe, the Belgian Jupiler league and two Belgian Cups. These performances captured the attention of some of Europe's biggest clubs, and in 1996 Dino Zoff – then coach of Italian giants Lazio – flew out to Belgium to personally sign the Australian, stipulating in his contract that Okon would play sweeper and promising first team football. However, with the departure of Roberto Di Matteo to Chelsea – forcing him to play in midfield – and a succession of knee injuries resulted in game-time being limited. While he did return for the 1999 Scudetto decider that summer he departed the Roman club. This began a turbulent chapter of Okon's career, with spells at Fiorentina, Middlesbrough, Leeds United and Vicenza before returning to the country where he made his name with Oostende in 2004. After a brief spell with APOEL in Cyprus, Okon returned to Australia. He signed with A-League club Newcastle United Jets for the 2006–07 season. Okon fit into a well-constructed Jets side and helped then make the play-offs in 2007. Due to injury concerns, Okon decided to retire from professional football in June 2007. Okon played for amateur team West Ryde Rovers' over-35 Division 1 team in the GHFA.
Managerial career
On 24 June 2008, along with Alex Tobin, Alistair Edwards and Nicola Williams, Okon was a recipient of an inaugural three-year scholarship under the Elite Coaching Development Program led by the FFA. As part of the program, Okon spent time at Coverciano with the Italian U-23 side under Pierluigi Casiraghi in the lead up to the 2008 Olympic Games, and spent a stint studying the youth setup of PSV Eindhoven. On 2 September 2008 Okon was appointed assistant coach to Miron Bleiberg at Gold Coast United for their inaugural season. Before taking up his new role he took up an interim coaching role at APIA Leichhardt for their 2009 NSW Premier League season. On 30 October 2008 Okon was appointed to lead the Australian U-18 side at the Australian Youth Olympic Festival in the month of January, aimed as part of a long term view towards establishing the team for the 2012 Olympic Games. On 23 February 2010, Okon did not renew his contract with Gold Coast United, following the team's loss in the first round of the A-league finals. Since then he has gone away on tour with the Australian Olympic under 23 squad for a tournament in Vietnam where he was assistant coach to Aurelio Vidmar. On 19 April 2012 it was announced he was appointed head coach of the Australia national under-20 football team and Assistant coach of the Australia Olympic football team. On 29 August 2016, Okon was appointed the new manager of the Central Coast Mariners, signing a two-year contact. Okon replaced Tony Walmsley, who was sacked following Central Coast's FFA Cup elimination at the hands of National Premier Leagues Victoria team Green Gully SC. In Okon's debut as Central Coast manager, the Mariners drew 3-3 with Perth Glory at Nib Stadium, after coming back from 3-0 down at half time. Okon achieved his first win as Central Coast manager in his fifth game in charge: a 2-1 win over defending champions Adelaide United at Hindmarsh Stadium on 6 November 2016. On 20 March 2018 with the Mariners being at the bottom of the A League, it was announced that Okon had resigned from his position as manager of the Central Coast Mariners.
