Horsell was spotted by a scout from Plymouth Argyle while playing for his school, the King Edward VI Community College in his hometown Totnes.
In July 2006, after his release by Rovers,[2] he signed for Torquay United, by now managed by Ian Atkins as back-up for Nathan Abbey.
Abbey subsequently signed a contract with Brentford He made his full debut in the next game, a 1–0 defeat at home to fellow strugglers Macclesfield Town in which he was given the Man of the Match Award.
However, after the signing of Kevin Miller on loan from Southampton, Horsell returned to being second choice goalkeeper.
However, with the signing of both Simon Rayner and Martin Rice, Horsell chose to seek a move back to league football.