The new boys in Declan Kidney's squad
Richardt Strauss (Leinster)
A familiar face who has been a key part of Leinster's back-to-back Heineken Cup successes, South African Strauss has qualified to play for Ireland having lived here since 2009. An U-19 World Cup winner with his native land, he looks set to be on the bench for the clash with the Springboks on November 10.
Few players have gone straight from the U-20 squad to the senior set-up, but Ulster's Henderson (20) was massively impressive as Ireland overcame South Africa, England and France in the Junior World Cup last June. He looks set to be used at six by Ireland.
Despite only starting eight games for his province since making his debut in 2010, centre Marshall is in the squad because Kidney sees him as a long-term replacement for ageing No 12s Gordon D'Arcy (32), Paddy Wallace (33) and James Downey (31). A robust ball carrier with excellent hands.
One of the surprise packages of the season, this Limerick prop had started just once for Munster before the start of the campaign. Injury to Wian du Preez has handed him a chance and he's grasped it. Likely to back up Cian Healy and Tom Court and could see gametime against Fiji.