 Complete the following phrase:  Martin ONeill, a former European Cup winner as a player with Nottingham Forest, took charge of the club in June 2000. 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 ONeill only the second Celtic manager to do so after Jock Stein. In 2003, ONeill led Celtic to their first European final since 1970, pitted against Porto in the 