 Their promotion was secured after a 1–0 away win at Cheltenham Town on 25 April 2015.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 'Man of the Match' by the official sponsors, an award he went on to win again during a number of appearances and also making The Football League's 'Team of the day' on a few occasions during his time there.