 Guy started his career at Newcastle United and appeared for them once in the UEFA Cup.Guy joined Doncaster Rovers on loan during the 2004–05 season.Having impressed during his brief loan spell, scoring three goals in nine appearances, Guy signed a permanent deal with Dave Penney's side prior to the start of the 2005–06 season

Despite only scoring three goals in 31 league appearances throughout the 2005–06 season, Guy's pace and dribbling ability made him a handful for any defence, which helped him form an effective striking partnership with Paul Heffernan during the first half of the season.