The 20-year-old has been called up to the England squad for the friendly in Sweden, after only recently returning from an injury absence of over a year.
Wenger has again urged caution on the midfielder's management.
"Jack is generous on the football pitch - he gives 100%. I feel physically, he is quite there - slowly he gets stronger in every game, that means his basic fitness is good," said Wenger.
"Sometimes when you accumulate games you need to have a little rest again, to build on that, to recover and then go even harder.
"For us, what is important to know is to stop him before he gets to that point."