The former Shamrock Rovers boss was confirmed as Nigel Worthington's successor by the Irish Football Association on Wednesday, beating Jim Magilton and Iain Dowie to the job, and will start work on February 1.
O'Neill played as a midfielder or forward for Chimney Corner, Coleraine, Newcastle, Dundee United, Hibs, Coventry City, Aberdeen (on loan), Reading (on loan), Wigan, St Johnstone, Portland Timbers, Clydebank, Glentoran and Ayr United.
While at Newcastle in the 1987-1988 season he was the clubs top goal scorer with 12 goals in the top flight of English Football, playing alongside Paul Gascoigne amongst others.
Between 1987–1989 he made 48 appearances for Newcastle United scoring 15 goals.
Worthington's four-and-a-half-year reign ended in disappointment with a fifth-placed finish in their Euro 2012 qualifying group, while a record of one win in their last 13 fixtures - a home success against the Faroe Islands - made for grim reading.
The former Norwich boss was subjected to some fierce criticism from the stands in his last few matches at the helm, with sections of the fans regularly calling for his sacking.
Now McAllister, chairman of the Amalgamation of Northern Ireland Supporters' Clubs, wants everybody to get behind the new appointment.
Gary McAllister: "I think the relationship with the manager over the last year was at a very low ebb, but we need to look forward not keep looking back.
"As fans we've not had too much to celebrate in the last year but now is time to look forward. We all need to get behind Michael O'Neill.
"A new manager can create a new dawn, if you will. There's always a little sparkle and people are hopeful that it can lead to something good or a repeat of past glories.
"We have to realise we have lost a lot of players and we're entering a period of transition with a new manager but hopefully it can be successful.
"The main thing is he needs to be given time."
O'Neill performed admirably in his time at Shamrock, winning back-to-back League of Ireland titles and creating history by leading the club into the group stages of the Europa League, but his CV lacks the top job in England or Scotland that many felt would be a necessary requirement.
Dowie's Barclays Premier League experience (including a spell at Newcastle under Alan Shearer) and Magilton's time at Ipswich and QPR gave them the edge in that regard, but the IFA were won over by O'Neill's interview.
PREMIERSHIP HOLIDAY PROGRAMME
Saturday 31st December 2011
Manchester United v Blackburn Rovers 12:45
Arsenal v Queens Park Rangers 15:00
Bolton Wanderers v Wolverhampton Wanderers 15:00
Chelsea v Aston Villa 15:00
Norwich City v Fulham 15:00
Stoke City v Wigan Athletic 15:00
Swansea City v Tottenham Hotspur 15:00
Sunday 01st January 2012
West Bromwich Albion v Everton 12:30
Sunderland v Manchester City 15:00
Monday 02nd January 2012
Aston Villa v Swansea City 15:00
Blackburn Rovers v Stoke City 15:00
Queens Park Rangers v Norwich City 15:00
Wolverhampton Wanderers v Chelsea 15:00
Fulham v Arsenal 17:30
Tuesday 03rd January 2012
Tottenham Hotspur v West Bromwich Albion 19:45
Wigan Athletic v Sunderland 19:45
Manchester City v Liverpool 20:00
Wednesday 04th January 2012
Everton v Bolton Wanderers 20:00
Newcastle United v Manchester United 20:00
NEWCASTLE UNITED 20011/12
PREMIER LEAGUE
LIVERPOOL 3 NEWCASTLE 1 (Agger og)
Krul, Simpson, Williamson, Coloccini, Ryan Taylor (Santon 46), Obertan (Sammy Ameobi 84), Tiote, Cabaye, Gutierrez, Vuckic (Ben Arfa 65), Ba.
Subs Not Used: Elliot, Perch, Best, Shola Ameobi.
BOLTON 0 NEWCASTLE 2 (Ben Arfa, Ba)
Krul, Simpson, Coloccini, Williamson, Ryan Taylor, Obertan (Shola Ameobi 84), Cabaye (Perch 88), Tiote, Gutierrez, Ba, Best (Ben Arfa 61).
Subs Not Used: Elliot, Sammy Ameobi, Vuckic, Ferguson.
NEWCASTLE 2 WEST BROM 3 (Ba 2)
Krul, Simpson, Perch, Coloccini, Santon (Ryan Taylor 46), Obertan (Shola Ameobi 72), Vuckic, Tiote, Gutierrez, Best (Ben Arfa 61), Ba.
Subs Not Used: Elliot, Williamson, Abeid, Sammy Ameobi.
NEWCASTLE 0 SWANSEA CITY 0
Krul, Simpson, Perch, Coloccini, Santon, Obertan (Sammy Ameobi 82), Cabaye, Tiote (Vuckic 82), Gutierrez, Best (Shola Ameobi 71), Ba.
Subs Not Used: Harper, Williamson, Ben Arfa, Abeid.
NORWICH 4 NEWCASTLE 2 (Ba 2)
Krul, Santon (Ferguson 90), Simpson, Perch, Ryan Taylor, Obertan (Sammy Ameobi 80), Cabaye, Gosling, Gutierrez, Ba, Shola Ameobi (Smith 90).
Subs Not Used: Elliot, Ben Arfa, Lovenkrands, Best.
NEWCASTLE 0 CHELSEA 3
Krul, Simpson, S Taylor, Coloccini (Perch 27), R Taylor, Lovenkrands (Sammy Ameobi 71), Guthrie, Cabaye, Obertan, Ben Arfa (Shola Ameobi 46), Ba.
Subs Not Used: Harper, Santon, Gosling, Best.
MAN UTD 1 NEWCASTLE 1 (Ba pen)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan (Sammy Ameobi 65), Cabaye, Guthrie (Perch 74), Gutierrez, Ben Arfa (Lovenkrands 80), Ba.
Subs Not Used: Elliot, Santon, Gosling, Shola Ameobi.
MAN CITY 3 NEWCASTLE 1 (Gosling)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Ben Arfa (Lovenkrands 76), Guthrie, Cabaye (Perch 85), Gutierrez, Ba, Sammy Ameobi (Gosling 79).
Subs Not Used: Elliot, Santon, Smith, Shola Ameobi.
NEWCASTLE 2 EVERTON 1 (Heitinga og, R Taylor)
Krul, Simpson, Coloccini, Steven Taylor, Ryan Taylor, Marveaux (Sammy Ameobi 54), Cabaye (Gosling 37), Guthrie, Gutierrez, Best (Ben Arfa 73), Ba.
Subs Not Used: Elliot, Santon, Lovenkrands, Perch.
STOKE 1 NEWCASTLE 3 (Barr 3)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan, Guthrie (Gosling 90), Cabaye (Perch 78), Gutierrez, Best (Sammy Ameobi 86), Ba.
Subs Not Used: Elliot, Santon, Ben Arfa, Marveaux.
NEWCASTLE 1 WIGAN ATHLETIC 0 (Cabaye)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan (Marveaux 76), Cabaye, Tiote, Gutierrez, Best (Ben Arfa 46), Ba (Shola Ameobi 68).
Subs Not Used: Harper, Santon, Perch, Smith.
NEWCASTLE 2 SPURS 2 (Ba, Ameobi)
Krul, Simpson (Santon 77), Steven Taylor, Coloccini, Ryan Taylor, Obertan, Cabaye, Tiote, Gutierrez, Best (Shola Ameobi 71), Ba (Ben Arfa 71).
Subs Not Used: Elliot, Lovenkrands, Gosling, Marveaux.
WOLVES 1 NEWCASTLE 2 (Ba, Gutierrez)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan (Marveaux 90), Cabaye (Guthrie 89), Tiote, Gutierrez, Best, Ba (Lovenkrands 71).
Subs Not Used: Elliot, Santon, Ben Arfa, Sammy Ameobi.
NEWCASTLE 3 BLACKBURN 1 (Ba 3)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan, Cabaye, Tiote, Gutierrez (Marveaux 84), Ba (Ben Arfa 74), Best.
Subs Not Used: Harper, Guthrie, Lovenkrands, Perch, Sammy Ameobi.
ASTON VILLA 1 NEWCASTLE 1 (Best)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan, Cabaye, Tiote, Gutierrez (Sammy Ameobi 85), Best (Shola Ameobi 69), Ba (Marveaux 80).
Subs Not Used: Elliot, Guthrie, Lovenkrands, Perch.
QPR 0 NEWCASTLE 0
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Obertan (Sammy Ameobi 88), Cabaye, Tiote, Gutierrez, Best (Marveaux 82), Shola Ameobi (Ba 64).
Subs Not Used: Elliot, Santon, Guthrie, Lovenkrands.
NEWCASTLE 2 FULHAM 1 (Best 2)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Lovenkrands (Ba 62), Cabaye, Tiote, Gutierrez, Obertan, Best (Vuckic 78), Vuckic (Smith 85).
Subs Not Used: Soderberg, Marveaux, Sammy Ameobi, Ferguson.
SUNDERLAND 0 NEWCASTLE UTD 1 (R Taylor)
Krul, Simpson, Steven Taylor, Coloccini, Ryan Taylor, Tiote, Cabaye (Williamson 85), Barton, Obertan (Gosling 85), Gutierrez, Shola Ameobi.
Subs Not Used: Harper, Lovenkrands, Ba, Best, Marveaux.
NEWCASTLE 0 ARSENAL 0
Krul, Coloccini, Steven Taylor, Ryan Taylor, Simpson, Barton, Cabaye (Lovenkrands 81), Tiote, Gutierrez, Shola Ameobi (Best 73), Ba (Obertan 46).
Subs Not Used: Forster, Williamson, Gosling, Sammy Ameobi.
CARLING CUP
BLACKBURN 4 NEWCASTLE 3 (AET) Guthrie, Cabaye, Lovenkrands (pen)
Krul, Simpson (Sammy Ameobi 70), Perch, Coloccini, Santon, Marveaux (Obertan 77), Guthrie, Cabaye, Gutierrez, Ben Arfa (Lovenkrands 79), Ba.
Subs Not Used: Elliot, Abeid, Gosling, Ranger.
NOTTINGHAM FOR. 3 NEWCASTLE 4 (AET) Lovenkrands 2, Simpson, Coloccini
Elliot, Simpson, Coloccini, Perch, Ferguson, Abeid, Guthrie, Gosling (Shola Ameobi 70), Marveaux, Ben Arfa (Sammy Ameobi 70), Lovenkrands (Obertan 80).
Subs Not Used: Krul, Best, Dummett, Henderson.
SCUNTHORPE 1 NEWCASTLE 2 AET (R Taylor, Sammy Ameobi)
Krul, Simpson, Coloccini, Williamson (Steven Taylor 45), Ryan Taylor, Marveaux, Gosling (Vuckic 70), Cabaye, Lovenkrands, Best, Ba (Sammy Ameobi 65).
Subs Not Used: Soderberg, Abeid, Smith, Ferguson.
PRE-SEASON FIXTURES
NEWCASTLE 0 FIORENTINA 0 (Ab 63 mins)
Krul (Forster 46), Simpson, S Taylor, Coloccini, Enrique, Gosling (Ba 46), Cabaye, Vuckic, Jonas (Marveaux 46) Lovenkrands (R Taylor 61), Best (Shola Ameobi 46).Subs: Sammy Ameobi, Ranger, Tavernier, Williamson.
LEEDS UTD 3 NEWCASTLE 2 (S.Taylor, Vuckic)
Forster, Cabaye, Williamson, Barton, Simpson, Gosling, Gutierrez, Ba, Shola Ameobi, Taylor, Tavernier. Subs: Krul, Taylor, Best, Vuckic, Sammy Ameobi, Dummett.
COLUMBUS CREW 0 NEWCASTLE 3 (Ameobi, Coloccini, Vuckic)
Harper; Tavernier, S Taylor, Coloccini (Dummett, 54), Enrique; Gutierrez (Abeid, 85), Tiote (Smith, 62), Gosling, Marveaux (Vuckic, 76); Ameobi (Best, 75), Ba. Subs not used: Forster, Krul.
ORLANDO CITY 1 NEWCASTLE 0
Forster; R Taylor (Enrique, 26), S Taylor, Coloccini, Tavernier; Gosling (Vuckic, 71), Smith (Abeid, 74), Tiote, Gutierrez; Best (Ba, 74), Lovenkrands (Ameobi, 74). Subs not used: Krul, Harper.
SPORTING KANSAS 0 NEWCASTLE 0
Krul, Gosling, Coloccini, S Taylor, R Taylor, Marveaux (Tavernier 46), Tiote (Abeid 46), Ben Arfa, Gutierrez, Ba (Best 72), Lovenkrands (Smith 46).
DARLINGTON 0 NEWCASTLE 2 (Barton, Sammy Ameobi)
Forster; Simpson (Dummett), S Taylor (Tavernier), Williamson (Henderson), Ferguson (R Taylor); Barton (Abeid), Guthrie (Cabaye, Donaldson), Smith (Gosling), Vuckic (Sammy Ameobi); Ben Arfa (Richardson), Best (Ranger). Subs not used: Soderberg, Newton.