Henry, McFadden and Ryan will be joining up with the 'A' squad after being involved in the senior set-up at the start of this week.
There is one place remaining that will be confirmed when the starting line-up and replacements are named by Ireland 'A' coach Michael Bradley and team manager Joey Miles on Wednesday at 1pm.
Tickets are on sale in the O2 store in the Square Shopping Centre and from Elverys Stores in Fonthill, Dawson St., Suffolk St. and O'Connell St. You can also pay at the gate on the night.
Don't miss this chance to see some of the rising stars of Irish rugby in this historic first rugby match at Tallaght Stadium!
IRELAND 'A' Squad (v Argentina Jaguares, 'A' International Match, Tallaght Stadium, Friday, November 27, kick-off 7.30pm):
Isaac Boss (Ballymena/Ulster)
Ryan Caldwell (Dungannon/Ulster)
Ian Dowling (Shannon/Munster)
John Fogarty (De La Salle Palmerston/Leinster)
Chris Henry (Ballymena/Ulster)
Ian Humphreys (Ballymena/Ulster)