Australian all-rounder Mitchell Marsh was on Saturday ruled out of the fourth and final cricket Test against India which will be played in Sydney from the 6th of next month.Australia's physiotherapist Alex Kountouris said, fresh scans have revealed that the condition of Marsh's injured hamstring has deteriorated.He said, the focus is now on ensuring the all-rounder's comeback in the upcoming tri-series also involving India and England, ahead of the ODI World Cup in February-March.Marsh had picked up the injury while bowling during the second Test in Brisbane.The injury forced him out of the ongoing Melbourne Test. Rookie batsman Joe Burns was brought into the side to replace Marsh.