London Irish is in an Aviva Premiership relegation scrap with the Newcastle Falcons, so both sides will need their New Zealand contingent firing for them in the coming weeks.
The Exiles scored a crucial 23-18 win over Gloucester on the weekend.
Former Highlanders prop Halani Aulika scored an early try, while fullback Sean Maitland and former Auckland lock William Lloyd also featured. For Gloucester, John Afoa and Jeremy Thrush were in the pack, while fullback Tom Marshall was yellow-carded.
Thomas Waldrom's Exeter Chiefs are at the top of the log after a 20-12 win over Northampton, for whom wing Ken Pisi scored a try. His brother George Pisi was also in the starting line-up, as was wing Ahsee Tuala.
Jimmy Gopperth was among the points again for Wasps in their 39-12 defeat of Sale. The No 10 scored 19 points, including a try, while centre Charlie Piutau also dotted down. Sale's Johnny Leota received a 73rd minute yellow card.