Giteau out for three weeks
33-year-old Giteau underwent an operation on his groin in January and was omited for three months.
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He made his return for Toulan last week in the 19-16 European Cup quarterfinal defeat by Racing 92.
Capped 102 times by Australia, Giteau limped off during the quarterfinal game after an hour.
The news is a blow for coach Jacques Delmas and his men.
Giteau will miss Saturday's Top 14 match away to Pau and potentially Toulon's April 30 home fixture against Toulouse.
AFP