The Wallabies might have won three in a row for the first time since 2017 but "grumpy" coach Dave Rennie wants more ruthlessness, complaining they were not clinical enough against Argentina.

Buoyed by back-to-back upsets of world champions South Africa, Australia put Los Pumas to the sword 27-8 in Townsville on Saturday evening, but they lost focus early in the second half to give Mario Ledesma's men a glimmer of hope.