Liverpool are keeping a careful watch over their 16 senior players on international duty this week. The Reds have had some worrying news in terms of injuries of late and the last thing they need are further problems while star players are away. Alexis Mac Allister was ruled out of action for Argentina as they drew to Venezuela, but Thursday still saw five of the Liverpool squad in action. One of those was Trent Alexander-Arnold, who’s start at right-back for England against Greece signalled something of a changing of the guard for the Three Lions. So often benched for Kyle Walker since making …