On the whole, it’s hard not to conclude that this has been a rather damaging international break for Mikel Arteta and Arsenal. Martin Odegaard is ruled out of the North London Derby, and the Arsenal captain may now be missing deep into October. Riccardo Calafiori also picked up a knock playing for Italy, even if it is hoped to be relatively minor. That being said, there are reasons to be positive for Arsenal supporters too. Kai Havertz was excellent for Germany in a 5-0 win over Hungary, and youngster Ethan Nwaneri was in electric form for England under-21s. Of course, Arsenal might choose to …