Leinster backs Robert Kearney and Luke Fitzgerald have been called up to the Irish squad for the three-day training camp from 18-20 September.
Leinster's Luke Fitzgerald will be at the Ireland training camp
They come in as replacements for John Kelly and Anthony Horgan of Munster.
Ulster duo Paddy Wallace and Tom Court were included in the original 34-man squad named by coach Eddie O'Sullivan.
Fly-half Wallace and Australian-born prop Court, who both played in this summer's Churchill Cup, are among nine Ulster players in the party.
Three others who also featured in Canada - Jamie Heaslip, Matt McCullough and John Fogarty - also win call-ups.
Eoin Reddan, John Kelly, Anthony Horgan, Simon Easterby, and Frankie Sheahan return after injury.
Missing from the senior squad who toured New Zealand and Australia are Leicester lock Leo Cullen and Munster captain Anthony Foley.
Also absent through injury are Simon Best, Gordon D'Arcy, Mal O'Kelly, John Hayes, Johnny O'Connor and Jerry Flannery.
This camp allows us to look at our options
Ireland coach Eddie O'Sullivan, however, has left the door open for players who will miss the Dublin camp from 17-20 September.
"The Churchill Cup has opened up other possible options," said O'Sullivan.
"We felt it was worth bringing some of the players into the senior set-up to take a closer look at them and monitor their progress. This camp allows us to look at our options.
"There are some players who toured down under during the summer who are not part of this training camp, but this does not mean that these players will not be considered or figure in the autumn games."
There were no other major surprises although the inclusion of 24-year-old Court will raise a few eyebrows.
The Irish-qualified tight-head was a top shot-putter back home before switching to rugby where he was immediately included in the Queensland Reds Super 14 squad.
Before he played a full game for Ulster he was selected for the Churchill Cup and acquitted himself reasonably well.
Wallace, meanwhile, bounced back from a string of injury setbacks last season to shine for Ireland A at the Churchill Cup as a fly-half, and has shown a bundle of confidence wearing the number 12 jersey for Ulster this season.
Wallace is one of six uncapped players in the squad.
Backs: I Boss, T Bowe, G Dempsey, L Fitzgerald, S Horgan, D Hickie, R Kearney, G Murphy, B O'Driscoll, R O'Gara, O Reddan, J Staunton, P Stringer, A Trimble, P Wallace.
Forwards: R Best, N Best, P Bracken, T Court, S Easterby, J Fogarty, K Gleeson, J Heaslip, M Horan, D Leamy, M McCullough, D O'Callaghan, P O'Callaghan, M O'Driscoll, A Quinlan, F Sheahan, D Wallace, B Young.