Star Geelong recruit Jeremy Cameron will miss his side's season-opening clash against Adelaide after re-injuring his hamstring at training.

AFL Media'sย Mitch Cleary first reported on Friday morning that the gun forward's setback in a significant blow to the Cats.

"Breaking - Jeremy Cameron OUT of Geelongโ€™s clash with Adelaide tomorrow. Re-injured his hamstring," Cleary tweeted.ย 

The Cats have since confirmed the 27-year old's injury on the club website.

"Geelong forward Jeremy Cameron will miss the start of the 2021 AFL season after suffering a hamstring strain at training," the statement reads.

"The 27-year-old Cameron felt a twinge at the end of Wednesdayโ€™s session and a scan revealed the strain."

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Cats general manager of football Simon Lloyd said Cameron would miss at least the first two weeks.

โ€œJeremy has started his rehabilitation program but will not be available for at least the opening two rounds,โ€ Lloyd said.

Cameron has endured an interrupted pre-season after hurting his hamstring at training in late January but returned to play in both of the Cats' pre-season games.

Cleary reports that scans have revealed another strain, leaving the 27-year old sidelined for the foreseeable future.

The spearhead has a history of hamstring problems on both legs, meaning you would expect Geelong to take a very cautious approach with its boom recruit.

The Cats gave up three-first round pics to acquire Cameron from the Giants in the trade period.

Geelong and Adelaide face off at 4.35pm at Adelaide Oval on Saturday, with official line-ups to be announced at 6.20pm tonight (all times AEDT).