Grylls set to chase WA Nats leadership

The WA Nationals are set for a possible leadership spill, with former leader Brendon Grylls believed to want a return to the top job.

A special party room meeting called for the Nationals' 12 WA MPs could decide whether or not Mr Grylls challenges leader Terry Redman.

Mr Grylls, aged 43, stepped aside in 2013 and was replaced by Mr Redman, the Minister for Regional Development and Lands.

Mr Grylls was leader when the Liberal-National coalition formed government under Premier Colin Barnett in 2008, ending nearly eight years under Labor.