ganguly is suffering from hip inury(according to john gloster team physio) and might breakdown in the middle of the tri series if allowed to play
and secondly,the odi in Oz is vastly different from subcontinent
the boundaries are long with better cricketing pitches(more bouncier than our pitches back home)often testing the physical endurance of the player not just the technique in batting, bowling or fielding
Without a doubt ganguly is one of the finest cricketer india has ever produced in both forms of the game
but i think its time for him to take some rest(at least for the reason of hip injury)

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