Progressing through one of the U’s regional development centres, Leon was a regular for the United U18 side in the 2015/16 season whilst a first-year scholar at the Cambs Glass Stadium.

An athletic right-back with pace to burn, he impressed enough to be handed a first-team start by Shaun Derry in the EFL Trophy win at Shrewsbury in September 2016, aged just 16 years and 283 days. Leon made two further appearances during the home fixtures with Middlesboro U23s and Scunthorpe in the same competition, before signing a three-year professional deal in November. He will now ply his trade with the U’s until June 2019. Highly-rated, Leon subsequently made his league debut for United in the 4-0 home win over Notts County in January.