West Coast midfielders Andrew Embley and Daniel Kerr and Fremantle's Hayden Ballantyne have been ruled out of Sunday's AFL western derby.

Kerr suffered an injury during the warm-up, but it was unclear whether he had re-injured the hamstring he had surgery on last year or suffered a fresh complaint.

Embley also injured his hamstring during the warm-up.

The pair will be replaced by Brad Sheppard and Andrew Gaff.

Ballantyne was named in the side but failed a late fitness test on his suspect hamstring, and Jayden Pitt has taken his place.

The Dockers have won seven derbies on the trot and will stay within touch of the top four with a win over West Coast.

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