Ireland to test fitness of Sean O’Brien and Jared Payne before Australia match

• Back-rower and centre sat out Friday’s captain’s run in Dublin• Defence coach Andy Farrell optimistic both will be fit to playIreland, already blighted by injury after last weekend’s battle with the All Blacks, will give fitness tests to Sean O’Brien and Jared Payne on Saturday morning for their final autumn Test against Australia after they sat out Friday’s captain’s run at the Aviva Stadium.Peter O’Mahony has been put on standby should O’Brien pull out of the back row while Rory Scannell would replace Jared Payne in the centre. That would leave Ireland without both the midfielders who star…