At the age of eight, Maguire took up wheelchair basketball, where he was coached by Josie Cichockyj. He now trains at Kirkby Athletics Club. Magurie won the under-17s mini-marathon events at the 2014 and 2015 London Marathons. In 2016, Maguire was part of the British 4 × 400 metres relay team that won the 2016 IPC Athletics European Championships non-medal event.