 He made his League of Ireland debut for the Irish club on April 6, 2007, coming on as a substitute in the 83rd minute of a 1–0 win over Galway United.He scored his first goal for the Saints on the 15th of July.On July 17, 2008, Guy was written into the St Pat's history books as he scored the only goal in a UEFA Cup First Qualifying Round match against JFK Olimps Riga of Latvia, keying the club's first-ever away European win.