Star Carlton midfielders Patrick Cripps and Adam Cerra have been grounded by injury, while Port Adelaide captain Tom Jonas has fallen out of favour yet again ahead of the Power's top-of-the-table clash with Collingwood.
Cripps (corked leg) and Cerra (hamstring tightness) were ruled out of Saturday's match against West Coast at Marvel Stadium as a precaution, with the duo joining forward Harry McKay (knee) on the sidelines.
