Robbie Henshaw will Associate Bundee Aki in Japan for his first taste of the World Cup at Center in Irelands Pool A decider against Samoa on Saturday.
The British and Irish Lions powerhouse has missed all three of Irelands World Cup games so much, in practice after landing in Japan, having picked up a hamstring injury.
But that the 26-year-old is fit and prepared to fire into a match Ireland should win to ensure their place.
The majority of their guns has rolled out to have the physical and attacking Samoans, though Jordan Larmour has put in at full-back in place of Rob Kearney.
Tadhg Beirne simplifies his Munster colleague Peter OMahony in blindside flanker, with boss Joe Schmidt eager to alleviate the workload.
While Joey Carbery carries a seat on the seat, with Ireland buoyed to possess play-makers back to full 26, johnny Sexton begins at fly-half .
Ireland: 15 Jordan Larmour, 14 Keith Earls, 13 Robbie Henshaw,12 Bundee Aki, 11 Jacob Stockdale, 10 Jonathan Sexton, 9 Conor Murray, 1 Cian Healy, 2 Rory Best (c), 3 Tadhg Furlong, 4 Iain Henderson, 5 James Ryan, 6 Tadhg Beirne, seven Josh van der Flier, 8 CJ Stander
Replacements: 23 Andrew Conway, 16 Niall Scannell, 17 Dave Kilcoyne 19 Jean Kleyn 21 Luke McGrath, 22 Joey Carbery
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