Scans have confirmed this morning that Nick Riewoldt has a low grade calf strain.
The results showed he suffered the strain in a different area of his calf than where he experienced soreness during the week.
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He will be assessed over the next 48-72 hours.
The club will make a decision on his availability for round four later in the week.
Meanwhile, young gun Jack Lonie has been cleared of any injury after being subbed out of yesterday's game with what appeared to be a knee injury.
He was assessed after the match and cleared by St Kilda medical staff to play round four.
