Humphreys earned his first call-up earlier in the season, but both Frank and Johne are now in line for their first A international appearances. The trio will be following in the footsteps of Shane Jennings, who captained the A side during last year's tournament and has just been selected in the Ireland senior squad for their summer tour of Argentina.
The team will be coached by Connacht's Michael Bradley with Ulster's Allen Clarke as his assistant, and will play three games during the tournament, kicking off against Canada on May 19. The squad will be captained by John Fogarty.
"Last years tournament was an excellent experience for the players," said Bradley. "Three tough games in an intense period makes it a steep learning curve, but we came out of last year's tournament with three good performances.
"This year's squad has less experience, so we will be looking to the senior players to provide the leadership. Canada and the New Zealand Maori again offer international-class opposition and I think the tournament plays an important role in developing the players experience at this level."
Ireland A squad
Forwards (15)
Ryan Caldwell (Dungannon/Ulster)
Sean Cronin (Shannon/Munster)
Andrew Farley (Buccaneers/Connacht)
Declan Fitzpatrick (Belfast Harlequins/Ulster)
John Fogarty (Buccaneers/Connacht) Captain
David Gannon (Buccaneers/Connacht)
Ray Hogan (Galwegians/Connacht)
Stephen Keogh (Shannon/Leinster)
John Lyne (Lansdowne/Leinster)
John Muldoon (Galwegians/Connacht)
*Johnny O'Connor (Wasps)
John O'Sullivan (Garryowen/Munster)
Michael Ross (Harlequins)
Devin Toner (Lansdowne/Leinster)
*Roger Wilson (Belfast Harlequins/Ulster)
Backs (13)
Darren Cave (Belfast Harlequins/Ulster)
Keith Earls (Thomond/Munster)
*Luke Fitzgerald (Blackrock College/Leinster)
John Hearty (Galwegians/Connacht)
Ian Humphreys (Leicester Tigers)
Chris Keane (Buccaneers/Connacht)
Seamus Mallon (Northampton)
Frank Murphy (Leicester Tigers)
Johne Murphy (Leicester Tigers)
Paul McKenzie (Belfast Harlequins/Ulster)
Fergus McFadden (UCD/Leinster)
Danny Riordan (Buccaneers/Connacht)
Johnny Sexton (St.Mary's College/Leinster)
N.B. *Capped at full international level
Ireland A schedule
Saturday, May 19 Ireland A vs Canada at Sandy Park, Exeter (kick-off 8pm)
Tuesday, May 29 New Zealand Maori vs Ireland A at Sandy Park, Exeter (kick-off 8pm)
Saturday, June 2 Barclays Churchill Cup Finals Day at Twickenham Stadium
Ticket information is available on the tournament website http://www.barclayschurchillcuprugby.com/