which Northern Irish professional footballer  was part of Manchester United United Trinity or the Holy Trinity
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United Trinity In association football, the United Trinity or the Holy Trinity refers to the Manchester United trio of George Best, Denis Law, and Sir Bobby Charlton, who helped United become the first ever English club team to win the European Cup in 1968.
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George Best George Best (22 May 1946 – 25 November 2005) was a Northern Irish professional footballer who played as a winger for Manchester United and the Northern Ireland national team. In 1968, he won the European Cup with Manchester United, and was named the European Footballer of the Year and FWA Footballer of the Year. The Irish Football Association described him as the "greatest player to ever pull on the green shirt of Northern Ireland".
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Hugh Ferguson (footballer) Hugh Ferguson (1926–1994) was a Northern Irish professional footballer who played as a full back.
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John McClelland (footballer, born 1955) John McClelland (born 7 December 1955 in Belfast) is a former Northern Ireland international footballer who played for several teams during a 23-year career. He works for Leeds United as part of the tour groups for Elland Road.
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Darren Kelly Darren Kelly (born 30 June 1979) is a Northern Irish former professional footballer who played as a defender. He is the manager of Northern Premier League First Division North club Hyde United.
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Jimmy Dunne (footballer, born 1947) James Christopher Dunne (born 1 December 1947 in Dublin) is an Irish former professional footballer. He played as a central defender or midfielder.
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Tony Grimshaw Anthony "Tony" Grimshaw (born 8 December 1957) is an English former footballer. His regular position was at full back. He was born in Manchester. He played professionally for Manchester United – for whom he made one league appearance during the 1975–76 season
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Craig Cathcart Craig George Cathcart (born 6 February 1989) is a Northern Irish professional footballer who plays as a centre-back for Watford and the Northern Ireland national team. He has also captained his country's under-21 side.
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Gary Deegan Gary Deegan (born 28 September 1987) is an association footballer, who plays as a midfielder for Cambridge United. Beginning his career in his native Ireland, he has since played in the Scottish Premiership for Hibernian and various clubs in all three divisions of the English Football League.
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Peter Kennedy (footballer) Peter Kennedy (born 10 September 1973) was a Northern Irish football defender/midfielder. He has three children, Annie, Olivia and Peter. In 1995/96 he was named as the Ulster Footballer of the Year. After his first spell in Northern Ireland he had a successful spell in English football, initially joining Notts County in August 1996 where he scored once against Newcastle Town in the FA Cup, before moving onto Watford a season later. In his first season, he led Watford to promotion to Division One as their highest goalscorer. He scored two goals in quick succession in the derby with Luton Town, a hat-trick against Southend United, and a splendid long-range effort against Sheffield Wednesday in the FA Cup. The following season was arguably the highlight of his career as he helped Watford gain promotion to the Premier League in 1999. In the Premier League, he scored Watford's first goal of the season, a penalty against Wimbledon. He left Watford at the end of the 2000/01 campaign and spent three seasons at Wigan, spending a period on loan at Derby County where he scored once against Ipswich Town. His final English club was Peterborough United, after which he returned to Northern Ireland. At the end of the 2007–08 season Peter did not have his contract renewed by Portadown and left the club. He began training with Ballymena United FC but decided to retire from his footballing career to focus on becoming an accountant. After a year Peter came out of retirement and made a return to football by signing for Donegal Celtic FC who play in the IFA Championship.
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Shay McCartan Seamus Vincent "Shay" McCartan (born 18 May 1994) is a Northern Irish professional footballer who plays as a forward for League One side Bradford City. He also plays for the Northern Ireland U21 national team.
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Billy McGinley William David "Billy" McGinley (born 12 November 1954 in Dumfries) is a former professional footballer, who played for Leeds United, Huddersfield Town, Bradford City and Crewe Alexandra.
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Danny Keohane Danny Keohane (born 16 March 1987 in Donegal) is a professional Irish footballer, last at Ballinamallard United.
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Tommy Dougan Thomas Dougan (born 22 November 1915 - "unknown") was a Scottish footballer. His regular position was as a forward. He was born in Holytown. He played for Alloa Athletic, Tunbridge Wells Rangers, Plymouth Argyle, Heart of Midlothian, and made four appearances for Manchester United.
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Greg Cunningham Gregory Richard "Greg" Cunningham (born 31 January 1991) is an Irish professional footballer who plays as a left back for Preston North End and the Republic of Ireland national team.
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Danny Philliskirk Daniel "Danny" Philliskirk (born 10 April 1991) is an English professional footballer who plays as a forward for Blackpool. Born in Oldham, Greater Manchester, he began his career as a junior with Oldham Athletic before moving to Chelsea. Having failed to break into the Chelsea side he spent time on loan at Oxford United before signing for Sheffield United. Having been on the fringes of first team football he was eventually released to allow him to join Coventry City on a short term contract, before his return to Oldham. In January 2016, he signed for Blackpool on a two-and-a-half year deal with the club having an option to extend a further year.
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Frank Quinn (footballer) Born in Saltcoats, Ayrshire, Quinn played for local junior club Saltcoats Victoria before turning senior with Celtic in November 1946. Having failed to become a first team regular, he was released in 1948, joining Dundee United on a free transfer on 18 August 1948. He scored a hat trick for the reserve team on the same day. After making his first team debut against Alloa Athletic on 1 September, he quickly established himself, becoming part of a celebrated forward line known as the "Famous Five". Despite playing on the wing he was also a regular goalscorer, scoring over twenty goals in each of four consecutive seasons and finishing as United's leading scorer in the 1952-53 season. He was released by the club in May 1954, subsequently signing for Hamilton.
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Tony McDonnell Anthony "Tony" McDonnell (born 10 February 1976, in Dublin) is a retired football player for Irish side, UCD.
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Billy Johnston (footballer, born 1901) William Gifford "Billy" Johnston (16 January 1901 in Edinburgh – after 1932) was a Scottish professional footballer, who played for Huddersfield Town, Stockport County, Manchester United, Macclesfield Town, Oldham Athletic and Frickley.
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Gary Kelly (footballer, born 1974) Gary Oliver Kelly (born 9 July 1974) is an Irish former footballer who played his entire professional career with Leeds United.
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Stephen Murphy (footballer) Stephen Murphy (born April 5, 1978 in Dublin) was an Irish professional footballer who played for Belvedere, Huddersfield Town and Halifax Town, for whom he made 25 Football League appearances. He has also played for the Ireland U-21's.
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William Clay (footballer) William Clay (born 1883 in Belfast, Ireland) was a footballer who played in the Football League for Sheffield United and Leeds City.