Liverpool are slowly seeing some key players return after a busy summer of international football. The Reds have been working towards the new Premier League season for the past month, but have done so with a relatively young group. For new boss Arne Slot, that must have been a slight frustration. Although Slot has been impressed by some Liverpool youngsters, he would surely have been itching to work with some of the Reds’ biggest names. While some remain away for the time being and will only join up back at the AXA Training Centre, Slot was given a boost on Friday as Alexis Mac Allister return…