At outside half, Gatland will have Owen Farrell and Jonathan Sexton, while his scrum half options will be Conor Murray, Mike Phillips, and Ben Youngs.
Farrell will line up alongside the veteran centre Mike Catt, 35, who has plenty of experience at fly-half.
Former Great Britain rugby league captain Farrell will miss the match after picking up a calf strain, while he has been joined on the sidelines by Barkley after the Bath man picked up a dead leg during training.
Mr O'Farrell says he will join the federal Liberals and oppose Ms Gillard's plan to introduce a carbon tax next year.
Farrell, whose salary will be funded jointly by the RFU and Saracens, is the latest player to switch from the 13-man code to union.
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Farrell, 32, will be joined at Sarries by 16-year-old son Owen, like his father an inside centre, who has joined their academy on a three-year deal.
If natural gas is to win by default and utilities are to get rid of all their coal and nuclear, future utility chiefs will have some sleepless nights, adds Tom Farrell, chief executive of Dominion Resources.
Farrell: Our view is that there will be a wide range of price points for games in the future.
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Colin Farrell plays Captain John Smith, who lands in 1607 at what will become Jamestown, Virginia.
Barry O'Farrell, the state's Liberal leader and now its premier, will complicate life for Ms Gillard.
Shane Victorino (strained left hamstring) is not running full speed yet and manager John Farrell said it's "probably a little premature" to say the speedy outfielder will go out on a minor league rehab assignment Monday or Tuesday.
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