Joe Schmidt is hopeful Robbie Henshaw will be fit for Ireland's second Pool D game with Romania.
The Connacht centre misses out on a place in the side to face Canada in Ireland's World Cup opener as he has a tight hamstring.
The Irish team in full sees Rob Kearney at full back, Dave Kearney and Earls on the wings with Payne and Fitzgerald in the centre.
Conor Murray and Johnny Sexton form the three-quarters.
There's a front row of Jack McGrath, Rory Best and Mike Ross.
Captain Paul O'Connell is partnered in the second row by Iain Henderson.
Peter O'Mahony is blindside flanker, Sean O'Brien on the openside, and Jamie Heaslip is at number 8.