Clarke's injury was "substantial" and it was too early to say when he may be able to make a comeback, said Cricket Australia team doctor Peter Brukner.
An emotional Brukner said the 25-year-old Hughes suffered an vertebral artery dissection after a cricket ball struck his neck .
Watson completed light running drills before another lengthy batting nets session on Saturday as he recovers from a hamstring injury.
The Australian players have been asked to show their team doctor exactly what they are ingesting in India.
The warning to to be careful about intake of supplements came in the wake of the drugs saga affecting rugby clubs.
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