Career
He also played two seasons in the North American Soccer League. In 1978, Henderson began his career with Shamrock Rovers. Mainly a reserve goalkeeper, he made his debut on 25 April 1978 and impressed enough to be called into the Republic of Ireland under-21 national football team, earning two caps in 1979.
Also in 1979, Henderson spent his the summer on loan to the Toronto Blizzard of the North American Soccer League.
Henderson returned to Shamrock Rovers and soon established himself in the first team From 1977 to 1981 he made 35 league appearances, keeping 20 clean sheets.
He also played one game in the Union of European Football Associations Cup Winners" Cup. On returning to Ireland, Henderson joined Saint Patrick"s Athletic, making his debut against Home Farm on 22 November 1981.
Teammate Paul McGrath later said that "Henderson was as good a goalkeeper as I"ve played in front of".
Henderson signed for Home Farm F.C. in November 1984, spending two uneventful seasons before signing for Drogheda United in 1986. When the FAI were asked by the Olympic Council of Ireland to put forward a team to attempt qualification for the 1988 Olympic Games, Henderson would add Olympic caps to his league and U21 honours. In 1987 Henderson was signed by Brian Kerr for his second spell with Saint Patrick"s Athletic.
In his first year back, Saint Pats finished in second place.
Two years later they went one better, winning the club"s first championship in thirty-four years. A feature of Henderson"s time with Saint Pats would be his enforced absence from game due to work commitments.
Henderson was a full-time fireman and often called away at short notice. Unfortunately for Saint Pats they hit a severe financial crisis and most of their championship winning team left.
Henderson joined Mick Moody and John McDonnell in joining Shamrock Rovers.
In September 2009, Henderson was inducted into the Saint Pats hall of fame. Henderson would continue to play for Bohemians until his retirement in 1998. He came close to adding another title in 1995/96 before eventually losing out to Saint Patrick"s Athletic.
Since retiring as a player, Henderson has worked as a scout or a coach for Aston Villa, Derry City, Bohemians and Hibernian.
His father, Paddy Henderson, played for Shamrock Rovers in the 1960s, winning the FAI Cup in 1962.