Crystal Palace are gearing up for a busy end to a summer window that has already been hectic for Oliver Glasner and his staff. The Eagles kickstart their Premier League campaign this week, with hopes that Selhurst Park will see plenty more of the exciting football witnessed towards the back end of last season. It will take plenty of effort from Oliver Glasner and those around him to reach those levels again following a tough summer. Plenty of the Crystal Palace squad returned to pre-season late after their involvements in the international tournaments played during the break. That may take som…