Ireland hooker Sean Cronin will miss the Six Nations after being ruled out for up to 10 weeks with a hamstring injury.
The 30-year-old sustained a hamstring tear during Leinster’s Guinness PRO12 win over Zebre on Jan. 6.
Cronin had been expected to deputise for Rory Best during the championship. His absence brings Leinster’s James Tracy, Munster’s Niall Scannell, Ulster’s Rob Herring and Connacht’s Dave Heffernan into selection contention.
Ireland kick off their Six Nations campaign away to Scotland on Feb. 4.
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