Star wing Cheslin Kolbe is a South Africa injury worry as the prepare to face Wales in Sunday's World Cup semi-final.
The 25-year-old left the field late on in their quarter-final win against hosts Japan.
He sat out Tuesday training having also been ruled out of their game against Canada because of an ankle problem.
"We are trying to manage him and give him the best opportunity to recover." said Stick.
"Hopefully, he will be ready."
Kolbe has scored two tries at the tournament and Wales defence coach Shaun Edwards has likened him to 2003 England World Cup winner Jason Robinson.
Injury fears are also on Welsh minds, but skills coach Neil Jenkins expects centres Jonathan Davies and Hadleigh Parkes to make the semi-final.
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