St Kilda key forward Fraser Gehrig will go on the AFL club's long-term injury list.

Gehrig's form this year has been a major concern since he came back from his retirement at the end of last season.

He has also battled arthritis in his hands.

The decision means the underperforming Saints can elevate a rookie onto their senior list.

Under long-term injury rules, Gehrig will be out of action for at least eight weeks.

Meanwhile, St Kilda have re-signed defender Jason Gram for another three seasons.

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