McFadden had been due to join the Melbourne Demons until the pandemic forced him back.[15] He joined the Donegal management team as strength and conditioning coach ahead of the 2021 season.[16] Mattie Brady replaced him ahead of the 2022 season.[17]
He is the younger brother of Colm McFadden. There is a seven-year age difference.[19] Both McFaddens were part of the Donegal team that won the 2012 All-Ireland Senior Football Championship, though Antoin did not play in the final. His brother, Colm, scored Donegal's second goal in the tenth minute and contributed four more points to the winning total.[20] Antoin McFadden also has another brother, fifteen years his senior.[19]
^ ab"Ulster U21FC: Murphy leads Donegal to title". Hogan Stand. 8 April 2010. Retrieved 8 April 2010. In the next attack, substitute Anton[sic] McFadden's attempted ball inside bounced over Smith's crossbar to confirm that this was to be Donegal's night.
^Ferry, Ryan (30 July 2020). "Big match at the Bridge". Donegal News. p. 60. There are injury concerns over Daniel McLaughlin and Martin McElhinney, but they have been boosted by the return of Antoin McFadden, Stephen Doak, and Ciaran Kelly, who were all based a way from home before the lockdown.
^Craig, Frank (13 August 2020). "Michael's gunning for third win on the bounce". Donegal News. p. 59. [Antoin] McFadden is back in his home club jersey following a five-year hiatus that took him to places like America, Australia, and even Limerick.
^"McFadden addition". Donegal News. 7 January 2021. p. 56. The St Michael's club man… was about to start a new role with the Melbourne Demons just last year. However, the Covid-19 pandemic meant those plans were shelved.
^Craig, Frank (23 December 2021). "MacNiallais blow for Donegal". Donegal News. p. 64. Ex county star Paddy Campbell has joined the coaching set-up alongside Bonner and Stephen Rochford while Tyrone native Mattie Brady, who is from Dungannnon, is the county's new full-time strength and conditioning coach. Dr Ciarán Kearney — who has worked very closely with Paddy Tally in the past — has also come on board. Dr Kearney's chief role, according to one player that[sic] previously worked under him, is one of 'building a culture around a team'.
^ abcScott, Ronan (19 March 2020). "Donegal legend [Colm] McFadden recalls impact made by Jim McGuinness". Gaelic Life. Retrieved 19 March 2020. Also published as "Colm Rain or Shine" in the Donegal News of the same date, 19 March 2020: pp 50–53. "Colm has one brother who was eight years older, and another who is seven years younger, so there wasn't the sibling rivalry that other families might have had".