The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
The 33-year-old, who won the RBS 6 Nations Grand Slam with Ireland in 2009, has 85 caps to his name but missed the summer tour to New Zealand and has not played internationally since March.
A Munster official statement confirmed: "Paul O'Connell is undergoing treatment for a lower back complaint.
“His treatment is progressing satisfactorily. He will see a specialist for further review in the New Year."
O'Connell's last appearance came in mid October when he played for Munster in the Heineken Cup clash with Edinburgh at Thomond Park.
While the date of his return remains uncertain, O’Connell and Ireland coach Declan Kidney will be hoping he returns in time to take part in the 2013 RBS 6 Nations.