Troy Buswell's political future could be decided by Premier Colin Barnett after it was revealed the WA Treasurer allegedly crashed a ministerial car after hours of drinking at a wedding.

The Premier is expected to address Mr Buswell's absence, which he previously said was due to "health issues", at 10.30am on Monday.

Troy Buswell was on a two week absence for 'health reasons'. Credit:Philip Gostelow

The alleged crash occured near Mr Buswell's home on Roberts Road in Subiaco on February 23.