After a short period at Wigan Athletic in 2003, he joined West Bromwich Albion, with whom he again won promotion to the Premier League. In 2006, he moved to Sheffield United, but much of his time there was spent on loan to other clubs, namely Leeds United, Leicester City and Scunthorpe United. Horsfield announced his retirement from football in 2008 after being diagnosed with testicular cancer, but after successful treatment he resumed his career, signing a six-month contract for Lincoln City in January 2009. In July of that year he was appointed player-assistant manager at Port Vale under Micky Adams, and the following summer he took up coaching full-time, before leaving the game completely in May 2012. In March 2013 he returned to playing football for Alvechurch.