Australian spearhead Mitchell Johnson is in doubt for the fourth Commonwealth Bank Test against India at the SCG, starting Tuesday, due to a hamstring injury.

Johnson didn't train with the Australians on Saturday and his condition will be further assessed in the lead-up to the fourth and final Test against India.

Johnson has taken 13 wickets at 35.53 so far this series, from 122.2 overs bowled in the past three Tests.

Johnson was absent as the Australia squad assembled for the now traditional 'Baggy Pink' photoshoot at the SCG, with former Test paceman Glenn McGrath.

If Johnson is unavailable for the SCG Test, Mitchell Starc and Peter Siddle are the other fast bowlers, along with Ryan Harris, in the 14-man squad.