With the versatile Berrick Barnes making a fine fist of fullback and Kurtley Beale desperate to return from the bench, there's no guarantees Cooper will wear No 10 against the Springboks on September 30 in Pretoria.
It was Shipperley's dislocation and compound fracture which led to Deans sticking with Cooper for the final 20 minutes, where he helped spark the fightback with a deft ball for Pat McCabe to score.
The Queensland winger will be named in the 28-man squad to tour South Africa and Argentina but will race time to be fit, making Beale a likely replacement.
Deans admitted he was most disappointed that Cooper allowed the Pumas the first try after being charged down by Tomas Leonardi.
But he didn't subscribe to the theory Cooper was trying too hard to spark the attack against the fast-rushing Pumas defence, instead pointing to confidence issues after a nine-month rehab from knee surgery.
"We shouldn't underestimate; it does take time to come back from significant injuries like that," Deans said.
James O'Connor's gradual return from a hamstring tear has also given Cooper extra breathing space.
The Wallabies' escape act did move them to second place on the standings, and another victory over the Springboks will virtually ensure they finish the inaugural tournament as runners-up to New Zealand.
- AAP