Assistant coach Steve Borthwick still believes England can improve on their Grand Slam winning season despite it possibly being their best season in years.
England will host Wales on Sunday in a one-off match at Twickenham before heading off to face Australia, over the June rugby international window, in a three-match Test series.
The 36-year-old former Bath and Saracens lock has labelled this weekend's encounter as a "great challenge".
Wales will travel to New Zealand to face the All Blacks in a three-match Test series.
"We are playing against a tremendous team who we have great rivalry against," Borthwick said told the England Rugby website.
"We are excited to have the squad back together and a big game to look forward to."
England sealed their first Grand Slam since 2003 earlier this year, and Borthwick has urged the side to use that success as a catalyst to improve further.
Should the Six Nations champions win the series down under, under the tutelage of Eddie Jones, they will become the first England side to do so.
Borthwick, who has made nearly 400 appearances for Bath and Saracens in the Premiership, firmly backs this group of players to become one of the greatest England sides.
"We were pleased to win the Six Nations and the Grand Slam but I think it highlighted we’ve got a lot of areas to work on," the former England captain said.
"So from a coaching point of view we are eager to be with the squad and help that development and see how far this team can go."