Ireland head coach Joe Schmidt has named Morris in his 42-man group to prepare for the internationals against Samoa, Australia and New Zealand in November.
It comes after the 25-year-old 's impressive start to the season for Tigers and his try-scoring exploits that helped Emerging Ireland to a second-placed finish in the IRB Tbilisi Cup.
Morris, who will link up for the two-day camp on Sunday, said: “It's a training camp but it is good to be recognised and pleasing that I'm in their thoughts.
"It was nice to be involved with Emerging Ireland and this is another step on from that."
The squad will assemble at Carton House for Sunday afternoon and Monday morning.
It is Schmidt's first Ireland training squad, and he said: “Selection was difficult as it's the first time we have had to narrow our focus a bit and determine a cut off point for players. A number of selections were very tight which is positive.
“The group is predominantly 'tried and proven' but with some newer faces as well. It's an opportunity to get to know the players as well as an opportunity to have a look ahead and start to get a little bit of organisation done for the Guinness Series.
“There is no doubting the challenge that autumn presents but we're looking forward to getting a little bit of a head start this weekend.”
Ireland Training Squad (22-23 September)
Stephen Archer (Cork Constitution/Munster)
Rory Best (Banbridge/Ulster)
Isaac Boss (Terenure College/Leinster)
Tommy Bowe (Belfast Harlequins/Ulster)
James Coughlan (Dolphin/Munster)
Sean Cronin (St. Mary's College/Leinster)
Gordon D'Arcy (Lansdowne/Leinster)
Keith Earls (Young Munster/Munster)
Luke Fitzgerald (Blackrock College/Leinster)
Declan Fitzpatrick (Dungannon/Ulster)
Cian Healy (Clontarf/Leinster)
Jamie Heaslip (Dublin University/Leinster)
Iain Henderson (Ballynahinch/Ulster)
Chris Henry (Malone/Ulster)
Robbie Henshaw (Buccaneers/Connacht)
Paddy Jackson (Dungannon/Ulster)
Shane Jennings (St. Mary's College/Leinster)
Rob Kearney (UCD/Leinster)
Dave Kearney (Lansdowne/Leinster)
David Kilcoyne (UL Bohemian/Munster)
Ian Madigan (Blackrock College/Leinster)
Luke Marshall (Ballymena/Ulster)
Mike McCarthy (Leinster)
Fergus McFadden (Old Belvedere/Leinster)
Jack McGrath (St. Mary's College/Leinster)
Kevin McLaughlin (St. Mary's College/Leinster)
Niall Morris (Leicester Tigers)
Conor Murray (Garryowen/Munster)
Sean O'Brien (UCD/Leinster)
Donncha O'Callaghan (Cork Constitution/Munster)
Paul O'Connell (Young Munster/Munster)
Brian O'Driscoll (UCD/Leinster)
Peter O'Mahony (Cork Constitution/Munster)
Eoin Reddan (Lansdowne/Leinster)
Mike Ross (Clontarf/Leinster)
Donnacha Ryan (Shannon/Munster)
Jonathan Sexton (Racing Metro 92)
Mike Sherry (Garryowen/Munster)
Richardt Strauss (Old Wesley/Leinster)
Devin Toner (Lansdowne/Leinster)
Dan Tuohy (Ballymena/Ulster)
Simon Zebo (Cork Constitution/Munster)
