World player of the year Brodie Retallick has been ruled out of rugby for four weeks with a shoulder injury.
The injury suffered to Retallick's left shoulder is the opposite joint from the ailment that saw him miss six weeks earlier in the season.
It's a blow for the Chiefs, coming in the same month Aaron Cruden was ruled out for the season with a knee injury, though Retallick will at least be able to return for the run in.
The lock will miss Saturday night's trip to Melbourne, after which the Chiefs have a bye before a top-of-the-table clash with the Hurricanes in Wellington. He will be replaced against the Rebels by Michael Fitzgerald, linking with Matt Symons to reform the same locking combination that accounted for Retallick's earlier absence.
Chiefs coach Dave Rennie has made a number of other changes to his run-on XV, with Andrew Horrell getting a chance in the No10 jersey. Marty McKenzie started at first five in the Chiefs' first match without Cruden, but the versatile Horrell now has an opportunity.
