Swans fortify for 'big battle' with Dockers midfield

Caleb Serong (left) and Isaac Heeney.
Fremantle's Caleb Serong (left) will put pressure on the Swans, including Isaac Heeney (pictured). -AAP Image

Not even a 10-game winning run is helping John Longmire sleep easy, and it's Fremantle's midfield on his mind while he is tossing and turning this week.

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