They are paid to play football. They've just been playing high level football at the worlds biggest international tournament. Pre-season has this misconception that these players will come back off their holidays overweight, unfit and unable to play football. Every single one of our players would likely have been given a plan by our coaches, dietitians etc. - probably working out in their spare time. Pre-season training next week for them simply just means they'll be joining up with the rest of the squad, not doing 10 laps round the training pitch like the olden days.
Vertonghen, Kane, Dier, Eriksen, Son, Lucas, Lloris and Sanchez will all start. I'm 100% certain.
Trippier, Dembele, Alderweireld obviously all still up in the air as two of them could still yet be sold. I think Trippier will probably be rested for Aurier or KWP to be honest, though I wouldn't be surprised to see him start.