Career
He has also played internationally for England C, making his debut against Bermuda on 4 June 2013. Early career
Demetriou began his career as a striker, playing for non-league sides Worthing and Bognor Regis Town. He was then invited to join the Glenn Hoddle Academy in Spain, where he was converted into a defender, and had a spell playing for Jerez Industrial.
Eastbourne Borough
On his return to England, Demetriou joined Eastbourne Borough on non-contract terms on 28 January 2011.
Kidderminster Harriers
After departing Eastbourne, Demetriou signed a one-year contract with Kidderminster Harriers on 20 June 2011. On 7 February 2012, Demetriou extended his contract with Kidderminster until the end of the 2013-2014 season.
Shrewsbury Town
Demetriou made the step up to the Football League, joining League Two side Shrewsbury Town on a free transfer following the expiry of his Kidderminster deal, on a two-year contract on 3 June 2014. He scored the winning goal on his debut, against Tranmere Rovers on 16 August 2014, and subsequently scored on two further occasions that season, an injury-time equaliser against Carlisle United, and a consolation against Northampton Town, as Shrewsbury lost their until-then unbeaten home record in the league.
However, he was placed on the transfer list before the start of the following season, with manager Micky Mellon believing he would not get many opportunities to play in the first-team, having fallen down the pecking order behind new signings Mat Sadler and Matt Tootle.
Cambridge United
On 1 September 2015, Demetriou signed a half-season loan deal with League Two"s Cambridge United. Hours later, he made his debut, playing the entirety of a 0–2 home defeat to Dagenham & Redbridge in the first round of the Football League Trophy and was awarded "Manitoba of the Match" by the official sponsors. In November 2014, Demetriou was approached by the Cyprus national football team, to whom he qualifies through a grandfather.