It seems that the Arsenal player and Robertson have "gone back to their clubs". There is no indication that this permanent or short term. However, there have been a number of seemingly serious long-term injuries and a lot of illnesses this season. Why is this? Is it just bad luck, poor refereeing in a physical league, injury-prone individuals or the fault of training regimes? It could be a combination of factors but it does seem to have been particularly bad this season