12 Dec, 14:42
Prop Cian Healy is expected to miss the start of the 2014 RBS 6 Nations after undergoing surgery on his injured ankle on Wednesday.
Horgan comes into the side in place of Tyrone Howe while the only other backline change, sees Girvan Dempsey return to the full-back position.
Up front Eric Miller has made an extraordinary recovery and will fill the number eight berth with Alan Quinlan preferred to Kieron Dawson and Quinlan's Munster colleague Marcus Horan returning to the front row at the expense of Justin Fitzpatrick.
Ireland (v Samoa, Apia, Friday, 3.30).
Girvan Dempsey John Kelly Mike Mullins Jonathan Bell Anthony Horgan Ronan O'Gara Guy Easterby Marcus Horan Shane Byrne Reggie Corrigan capt Leo Cullen Paul O'Connell Simon Easterby Alan Quinlan Eric Miller.
Replacements. Paul Shields Emmet Byrne Donncha O'Callaghan Aiden McCullen Brian O'Meara Paul Burke Gordon D'Arcy.