Stark dislocated the tip of his middle finger Monday while trying to hook midseason.
Mitchell Stark may miss the third test against South Africa in Sydney after injuring his left hand bowling arm finger on the first day of the Boxing Day test in Melbourne.
The fast bowler dislocated the tip of his middle finger while trying to make a mid-season catch at Long On Monday, and he quickly left the field for further observations and scans.
He later returned to the field but was not required to roll as South Africa rolled out for 189 and Cameron Green took 5 wickets. Starc bowled a total of 13 overs and took 2 wickets.
Despite continuing his Australian game of cricket on the second morning, Mr Starc said: