Influential defender Hayden Crozier has been ruled out of the Western Bulldogs’ round one clash with Collingwood.

Crozier suffered a shoulder injury in the third quarter of yesterday’s AAMI Community Series win against Melbourne.

Scans have since confirmed an AC joint injury for the 27-year-old, who will require surgery to fix the issue.

A return to play timeframe for Crozier will be determined following his operation.