England head coach Stuart Lancaster has called for his side to step-up ahead of their Test series against Argentina this month.
The 2013 Six Nations runners-up defeated a South American XV 41-21 last weekend in Uruguay, fielding several new players with ten leading stars away with the British and Irish Lions and several others rested.
England struggled with their opposition's physicality in the opening and closing quarters and Lancaster admits they have plenty of areas to improve in ahead of the Test series.
Lancaster will name his side on Thursday, but will have to make some tough decisions regarding the right personnel to compete at the breakdown.
"I think there is plenty to work on. We probably didn't get enough width in defence. Our general levels of accuracy, the players will be disappointed with. It's a step-up in mentality as much as anything," said Lancaster.
"It's the end of a long hard season for us and it will be a physical game for us on Saturday. At the highest level we know we have got to be better.
"With our set-piece getting good ball our backs began to show some of the skillsand creativity we have got and we have to put the package together for 80 minutes to get that first win in Salta.
"There are decisions to be made in the make-up of the back row and the bench. As you can see from the game, the breakdown will be fiercely contested on Saturday and there were times when we didn't deliver as good ball as we wanted.
"I have some decisions to make as to how we go about the game. The most important thing for me is it makes it clear how difficult it will be next Saturday.
"The sessions will be fiercely contested. We need to prepare well in order to get our mindset right for Saturday."