Fremantle Docker's best ruckman Aaron Sandilands will be sidelined for the next four weeks with a toe injury.

He suffered the injury to his left big toe during Saturday's 52-point win over Port Adelaide at AAMI Stadium.

It does not require surgery  but he will be wearing a moon boot to support and cushion it for the next two weeks.

It will be a big blow to the Dockers who have struggled with a spate of injuries at the beginning of the year, but won five out of eight games.