Stuart Lancaster has urged his England side to back up their win over Australia with victory against Argentina on Saturday.
With the hosts 13-6 down at half-time, tries from Chris Robshaw and Owen Farrell saw them run out eventual 20-13 winners.
And Lancaster was pleased with his side's efforts under the circumstances.
"To get the win, given the limited preparation time, is very pleasing," said Lancaster.
"We've played against a strong, experienced Australia team who have been together since before the Lions tour in the summer.
"Overall, we are growing, but it counts for nothing if we don't back it up next week."
Though the coach admits to feeling the pressure, he believes it is the start of a crucial year for England.
"I always feel the pressure to win, even though we've now won seven of eight games this year and eight of our last nine," he said.
"I felt it here because I knew if we won we'd build some momentum and space to grow.
"It means nothing though if we don't perform next week and win. It's a good start but we're not getting carried away."
Lancaster admits there is plenty for his side to work on in preparation for the visit of Los Pumas, though.
"We need to build on our set-piece and try and establish some continuity and rhythm to our attack. I thought the intent was there (against Australia) and the pressure ultimately told with Owen's try," he said.
"When you look back at the game we went through several examples of multi-phase attack, probably more so than the Australians, and our commitment to do that paid off in the end."