Ireland will offer a glimpse into their future when they name their new captain and team to face South Africa.
With seasoned campaigners Paul O'Connell, Brian O'Driscoll, Sean O'Brien, Stephen Ferris, Rob Kearney and Rory Best missing, coach Declan Kidney is having to delve deep into his playing resources. The optimistic prognosis over O'Connell's back injury was confounded on Wednesday when the 2009 Lions skipper's recovery was hit by a complication, forcing him out of the Springbok Test.
"Paul returned to training at the start of this week and took a full part in the squad sessions on Monday and Tuesday," read a statement released by the Irish Rugby Football Union. "However, he suffered a reaction and will not be fit for selection for this weekend's game."
The composition of the back row will be of interest in the absence of Ferris and O'Brien - two of Europe's most destructive players - with Peter O'Mahony and Kevin McLaughlin likely to join Heaslip.
With IRB ranking points critical to seeding for the next World Cup at stake, it is imperative they dispatch opposition that is also missing several big names.
South Africa remain heavy favourites for Saturday, but scrum-half Eoin Reddan insists Ireland have a point to prove.
"In reality, the reason to win it on paper is the World Cup rankings," Reddan said. "But for the country, the fans, the players themselves and the coaching staff, it would be a huge opportunity to put the summer tour behind us."