He capped his second season at the club by signing a one-year professional contract along with fellow youth prospects Ross Killock and Monty Gimpel.

He scored again against Tavistock in a 6–0 victory and featuring as a substitute in subsequent games versus Bodmin Town and Torquay United as Leeds recorded three wins from three on their summer tour.

His performances in further pre-season games would lead to the young striker joining fellow prospect Sam Byram on the fringes of the first team for the start of manager Neil Warnock's first full season in charge as he was assigned the number 26 shirt for the campaign.

He made his first team début for Leeds in the first game of the season coming on as a 76th-minute substitute against Shrewsbury Town at Elland Road in the League Cup fixture on 11 August 2012.

"[13][14] Poleon scored his first goal for the club in his second game versus Yeovil Town, equalising on the 74th minute mark at Huish Park in a 1–2 defeat.

[14] He continued his impressive early form over the following games; adding another assist in a 2–1 victory over Hartlepool United and his second goal in a 1–1 draw at home to Walsall.

During this match Poleon was involved in a controversial collision in which he appeared to push Ikechi Anya, resulting in him accidentally colliding with goalkeeper Jonathan Bond, and earning himself a yellow card.

[24] On 1 September 2014, in the final hour of transfer deadline day, Poleon signed a two-year contract with Oldham Athletic for an undisclosed fee.

[29] Poleon's contract at Crawley was cancelled by mutual consent on 2 September 2019 to enable him to join League Two Newport County on the same day until the end of the 2019–20 season.

[33] On 9 February 2021, Poleon joined National League South side Ebbsleet United on a free transfer following a successful trial period with the club.

[34] A successful February 2023 where Poleon scored seven goals in seven matches, taking Ebbsfleet fourteen points clear of the team in second position, saw the striker win the National League South Player of the Month award.

[38] On 16 June 2023, Poleon made his debut for the Saint Lucia national football team, in a 3–1 defeat to Martinique in the 2023 CONCACAF Gold Cup preliminary round.