As part of the Reading Academy, Samuel enjoyed a prolific start to the 2011–12 season, scoring 13 goals in 14 games for the under-18 side. As a result, he was rewarded with his first professional contract on 17 December 2011. He made his debut for Reading coming on as a 72nd minute substitute, for Garath McCleary, in Reading's 3–0 defeat away to Sunderland on 11 December 2012. On 3 January 2013 Samuel joined League One side Colchester United on a one-month youth loan deal. After making two appearances, he returned to Reading on 31 January. On 9 January 2014, Samuel joined team mate Lawson D'Ath at Dagenham & Redbridge on a one-month youth loan. He made his debut three days later against Fleetwood Town though he was forced off during the first half with a knee injury. Reading later confirmed that his loan had been cut short as the damage needed to be repaired surgically.
However, after a promising start, he fractured his ankle on 1 April in a 0–1 defeat to Leyton Orient thus ruling him out for the remainder of the season. He was sent back to Reading in order to start treatment in hope that he will be fit during pre-season.
Samuel made his debut England under-19 against Portugal on 7 October 2011. Samuel scored his first goal for the under-19s in his next match for them, against Ukraine, in a 3–1 victory on 9 October 2011.
Scores and results list England's goal tally first.