England head coach Stuart Lancaster has called on his team to produce a full 80-minute performance after beating Argentina 32-3.
First-half tries from David Strettle, Billy Twelvetrees and Ben Morgan put England comfortably ahead in Salta, before Argentina rallied to dominate possession and territory in the second half.
Despite being proud of his side for not conceding a try and being delighted with the performance of Christian Wade, Lancaster admitted that his team's penalty count was too high and would have to be reduced next week as a first ever series victory in Argentina is now a possibility.
"Christian did what he does in the Premiership. He sets our attack alight and he causes problems in defence," said Lancaster.
"A lot of the unseen work he did was effective, his positional play and his defensive kick-chase."
"We were accurate and played with intensity and pace which the Pumas struggled to deal with.
"In attack our intent to play and the speed and tries were excellent. The Pumas made it very difficult in the second half and we need to improve going into next week.
"Argentina had 70 per cent possession in the second half so I was pleased not to concede a try but we can't concede 15 penalties next week. We need to improve our discipline in that regard.
"A series clean sweep has not been achieved over here and I have plenty to go at in the review, I can assure you.
"I want England to develop the type of game that can win at the highest level consistently and in lots of areas we achieved that. The challenge now is to do it for 80 minutes - and that is the challenge for next week."