Varley says Munster are ready to push on
Munster, with new head coach Rob Penney in charge for the first time, opened their RaboDirect Pro12 campaign last Saturday with a 23-18 win over Edinburgh at Murrayfield and the New Zealander has made two changes from the side which started in the Scottish capital.
Archer comes in at tighthead prop for BJ Botha having been an unused substitute in Edinburgh, with the South African dropped to the bench. O’Callaghan has recovered from a small calf tear that kept him out of the final pre-season friendly against London Irish on August 24 as well as last weekend.