The team entered the season, having reached the 2014 All-Ireland Senior Football Championship Final.
[3] Thirteen players were added ahead of the 2015 Dr McKenna Cup, including goalkeeper Mark Anthony McGinley, Eoin McHugh, Ciaran McGinley, Conor Parke, Eunan Doherty (Naomh Conaill) Kevin McBrearty (Four Masters) and Ryan Malley (Ard an Rátha).
[6] Another veteran of the 2012 All-Ireland SFC winning campaign, Dermot Molloy, also departed, between the McKenna Cup's conclusion and League's beginning.
[7][8][9] Michael Boyle left for Boston before the 2015 Ulster SFC semi-final and Mark Anthony McGinley, who had earlier joined the panel, was promoted to his position.
[11] Gallagher's first match in charge of the county was a 2015 Dr McKenna Cup away defeat to Derry.