He spent two and a half seasons with Barnsley, including a loan spell with Peterborough United, before joining Luton Town in January 2019.

[4] Like his father John, Moncur began his career with Tottenham Hotspur as a schoolboy,[4] where he progressed through the club's academy until he was 13 years old.

[5] Born in Swindon, Wiltshire,[2] he was brought up in Loughton, Essex,[6] and studied at Roding Valley High School, playing for local club Buckhurst Hill.

[5] He was called up to the first-team for the first time for West Ham's home tie against Aldershot Town in the League Cup on 24 January 2011.

[21] Moncur made his debut for West Ham on 29 August 2012 when he came on as an 84th-minute substitute for Kevin Nolan in their 2–0 win over Crewe Alexandra.

Across the season, he made 28 Professional Development League appearances, scoring in victories at Everton in August 2012 and at home to Southampton in April 2013.

[4] West Ham manager Sam Allardyce allowed Moncur to train with Notts County for the club to cast an eye over him with a view to a loan move in November 2013.

[23] The move never materialised, before Moncur made his first and only start for the Hammers in their 5–0 defeat to Nottingham Forest in the FA Cup on 5 January 2014.

[28] Having spent the 2014–15 pre-season training with Colchester United, Moncur signed for the League One club ahead of the new season on 7 August, and would run until 11 January 2015.

[29] He made a goalscoring debut for Colchester on 9 August, coming off the bench to secure a point for his team in their 2–2 opening day draw with Oldham Athletic.

[33] On 14 November, after making 20 appearances for Colchester in all competitions, it was reported that Moncur was on the verge of signing a loan extension to remain with the club past January.

[42] He scored his third goal in as many games on 6 April to seal a 3–1 victory over Barnsley, sending Gavin Massey's pass into the back of the net on 86 minutes.

[51] On the back of his four goals in four games during September, Moncur, alongside Colchester teammate Jamie Jones, were shortlisted for the PFA Fans Player of the Month award for League One.

[52] He was named winner of the award on 6 October, fending off competition from fellow finalists Adam Armstrong of Coventry City and Burton Albion's Stuart Beavon.

[57] Moncur scored his first goal of 2016 and his tenth of the season on 9 January during Colchester's 2–1 FA Cup third round win against Charlton Athletic.

[58] After a goalless spell of two months, Moncur scored from the penalty spot to put the U's 3–2 ahead in a 3–3 home draw with Wigan Athletic on 12 March.

[61] Despite Colchester's eventual relegation from League One, Moncur continued his goalscoring with the opener in the U's 2–2 draw with Barnsley at Oakwell in their penultimate game of the season on 30 April.

[69] He scored the winning goal, a "stunning" free kick, in Luton's 3–2 victory over Portsmouth on 29 January 2019 that sent the club five points clear at the top of the League One table.