SYDNEY will be undermanned in defence with Aliir Aliir a late out for Sunday's clash against Richmond at the Gabba.
Robbie Fox comes into the side, while the Tigers go in unchanged.
The Swans will battle Jack Riewoldt and Tom Lynch with a smaller defence, with Aliir's form a concern.
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"Aliir has just struggled with a bit of form and we just want to get him back to his very best form," Sydney assistant coach John Blakey said.
"We obviously face a few issues with our height both down back and in the ruck but we think that we can manage that."
