The main problem with Japan in July is the humidity (and heat). It’s a long way to go, and there’ll be the jet lag to factor in - but I imagine the whole trip will be a week long, max, with plenty of recovery time before the big home friendly against some mid-table Spanish team whose name bears...
Well, the good news is that Japan is so much better for injuries than the US. Evidence? Man City went to Japan last July and they’ve had comparatively few injuries this season. Good to see the club learning from their mistakes…