Leinster and Munster have both been given a boost ahead of next week's Champions Cup quarter finals, with the pair set to welcome back their respective Cronins from injury.
Leinster hooker Sean Cronin missed Ireland's entire Six Nations campaign after suffering a torn hamstring in his province's Pro 12 win against Zebre in January. However Leinster say they're hopeful he can earn some minutes this weekend against the Cardiff Blues, before the Champions Cup quarter final against Wasps.
Josh van der Flier and Isa Nacewa are also making good progress on their respective shoulder and knee injuries, with van der Flier taking a small part in training last week.
However the outlook is less clear on Jamie Heaslip and Rob Kearney, who both missed Ireland's Six Nations finale against England on Saturday.
The province say Heaslip's injury is coming from a lower back issue, while Kearney will see a specialist tomorrow after suffering a knee injury.
— Leinster Rugby (@leinsterrugby) March 20, 2017
Munster also have good news on the Cronin front, with loosehead James Cronin back in full training, along with winger Alex Wooton.
The prop has been out of action since having surgery on a finger injury, which he picked up in their final Champions Cup pool game against Racing 92.
Irish internationals Andrew Conway, John Ryan and Niall Scannell will all link back up with the squad this week after featuring in Ireland's win against England, as will man-of-the-match Peter O'Mahony, who is expected to return to training on Thursday.
The province say that their remaining Six Nations contingent - Simon Zebo, Donnacha Ryan, CJ Stander, Conor Murray and Keith Earls - will all be rested for the coming week.