"Assuming the Hurricanes are still missing Dane Coles, it means both sides are missing characters who would make the contest more intense."
With Taleni Seu also out injured for several weeks, the replacement is likely to be Michael Allardice, not long back himself from a medium-term injury. He should partner Dominic Bird as the Chiefs look to get physical again versus their old rivals the Hurricanes.
Retallick is not the sole injury concern for Rennie, who is still missing Sam McNicol with concussion symptoms and now Toni Pulu with a hamstring pull. Charlie Ngatai is possible for Friday night, but was sick today. There were several walking wounded on the sidelines of Chiefs training this morning.
The Chiefs' 46-31 victory may sound like a romp, but there were some battered and bruised bodies, among them loosehead prop Kane Hames, who should be named in at least one of the squads on Thursday.
"There was quite a bit of contact... a few of the boys have facial features that have changed a bit," quipped Hames.
"The Hurricanes and the Chiefs are two teams that don't necessarily seem to get on as well as they possibly could. The Hurricanes have a lot of tactics around their line speed and being as physical as possible and the way they defend at mauls."
The winner of the game may well secure that coveted second berth in the New Zealand conference and the easier quarter-final in Australia next month.