Sydney Swans young gun Callum Mills has been ruled out of Friday night’s preliminary final clash against Geelong at the MCG.

Mills suffered a hamstring injury in Sydney’s qualifying final loss to GWS two weeks ago, and missed Sydney’s semi-final win over Adelaide last Saturday.

The 2016 Rising Star has impressed in his debut season, averaging just under 19 disposals in 21 games, helping Sydney to a minor premiership.

Mills did not travel with the team down to Melbourne, and the Swans will hold their final training session on Thursday night.