Craig Casey is one of thirteen players who’ve been released from the Ireland camp to play for their provinces this week.
The Munster scrum-half made his international debut off the bench in Saturday's 48-10 Six Nations win over Italy in Rome.
Casey is the only member of the matchday 23 in Rome returning to their province ahead of the weekend's slate of matches in the Guinness PRO14.
Jordan Larmour (hip), Tadhg Furlong (ankle), Dave Kilcoyne (head) and Ronan Kelleher (ankle) will all have their various problems assessed by the Irish medical staff this week.
A core group of 23 will partake in an Ireland training camp on Thursday and Friday.
Having scored the late match-winning try for Connacht away to Benetton, Bundee Aki stays with the western province this week along with Ultane Dillane and Dave Heffernan.
Ross Byrne, Ed Byrne, Josh van der Flier and Rhys Ruddock go back to Leinster in preparation for their top-of-the-table meeting with Ulster.
Stuart McCloskey started in Ulster's 21-7 win over the Ospreys on Friday night, and will be joined this week by Tom O'Toole as they gear up for the crunch game in Belfast.
Joining Casey at Munster this week will be Andrew Conway, Shane Daly and Chris Farrell.
Ireland players returning to provinces:
Connacht: Bundee Aki, Dave Heffernan.
Leinster: Ross Byrne, Ed Byrne, Josh van der Flier, Rhys Ruddock
Munster: Craig Casey, Andrew Conway, Shane Daly, Chris Farrell
Ulster: Tom O'Toole, Stuart McCloskey
Ireland training camp:
Billy Burns (Ulster) 6 caps
Keith Earls (Munster/Young Munster) 91 caps
Jamison Gibson Park (Leinster) 8 caps
Robbie Henshaw (Leinster/Buccaneers) 50 caps
Hugo Keenan (Leinster/UCD) 9 caps
Jordan Larmour (Leinster/St Mary’s College) 27 caps
James Lowe (Leinster) 5 caps
Conor Murray (Munster/Garryowen) 88 caps
Garry Ringrose (Leinster/UCD) 33 caps
Jonathan Sexton (Leinster/St Mary’s College) 97 caps
Ryan Baird (Leinster/Dublin University) 1 cap
Tadhg Beirne (Munster/Lansdowne) 20 caps
Jack Conan (Leinster/Old Belvedere) 18 caps
Will Connors (Leinster/UCD) 8 caps
Tadhg Furlong (Leinster/Clontarf) 47 caps
Cian Healy (Leinster/Clontarf) 107 caps
Iain Henderson (Ulster/Academy) 61 caps
Rob Herring (Ulster/Ballynahinch) 19 caps
Ronan Kelleher (Leinster/Lansdowne) 9 caps
Dave Kilcoyne (Munster/UL Bohemians) 41 caps
Andrew Porter (Leinster/UCD) 35 caps
James Ryan (Leinster/UCD) 34 caps
CJ Stander (Munster/Shannon) 49 caps