GEELONG captain Joel Selwood is in doubt for next week's semi-final after undergoing finger surgery on Friday.

Selwood dislocated his left middle finger during the final quarter of the Cats' loss to Port Adelaide in Thursday night's qualifying final.

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He had surgery to stabilise the joint, but the club is still hopeful he will be able to play next week.

The Cats will 'host' either West Coast or Collingwood in a cut-throat final most likely at the Gabba next week.