 Under his leadership, Celtic won three SPL championships out of five and in his first season in charge, the club also won the domestic treble, making O'Neill only the second Celtic manager to do so after Jock Stein.In 2003, around 80,000 Celtic fans travelled to watch the club compete in the UEFA Cup Final in Seville.Celtic lost 3–2 to Porto after extra time, despite two goals from Henrik Larsson during normal time.