They beat Wales, Scotland and Italy earlier this year before Brian O'Driscoll signed off from international duty with a famous win in France.
The next task at hand is a two-test Tour to Argentina starting on June 7, who have one eye on August's Rugby Championship.
"A lot of the players that play in the Rugby Championship for them won't be involved, but we're playing an Argentinean team that has played I think, eight or nine games together since March and they're unbeaten," he said.
"They won the CONSUR Cup, the Pacific Rugby Cup and they just beat a South American XV last week. They've spent a lot of time together, played together a lot so it's going to be very tough for us."