Two Crows will play off in the SANFL grand final next Sunday.

North Adelaide thrashed West Adelaide in today’s preliminary final, with Lewis Johnston playing an important role for the Roosters after missing a week with an ankle injury.

Johnston started as a loose man in defence and had 20 kicks, three handballs, took ten marks and kicked 1.1 in the 56-point win. 

Waiting for North next weekend is minor premier Norwood, coached by former Crows defender Nathan Bassett.

Mitch Grigg, who played a major role in the Redlegs' semi-final win, will be in the midfield.