Scans have revealed the extent of the calf injury suffered by Api Koroisau in last Friday's victory over Cronulla Sharks.
The Panthers hooker has been diagnosed with a grade one calf strain.
Although relatively minor in nature, the injury will see Koroisau miss this Saturday's 'sold out' clash with Wests Tigers.
His potential availability for the club's Round 17 game against Brisbane Broncos will be determined early next week.
Match Highlights: Panthers v Sharks