THINGS are going from bad to worse for Australia, with Peter Siddle in a major doubt for the second Test with a back injury.

Siddle has been sent for scans after experiencing discomfort against South Africa in Perth, and Joe Mennie is now in line to make his Test debut in Hobart.

Australia are yet to make any decision on a potential replacement bowler being drafted into the squad and are waiting to find out the result of Siddle’s scans before making any call.

Siddle was due for a follow-up scan given he’s spent the best part of six months out with a back injury, however the fact there has been a recurrence of pain is hardly a good sign.

With only four days until the second Test kicks off in Hobart, there is hardly any time.

Chadd Sayers and Jackson Bird loom as likely shadow players to be called in if a decision is made to add reinforcements.

As for Adam Voges who experienced hamstring soreness in Perth, it’s understood he will be available for selection.

Although Voges and Mitchell Marsh would now appear to be under pressure to hold their spots from Callum Ferguson.