Why Tuchel should return to O'Reilly at left-back

Since 2006, every World Cup winner has dropped points in their first or second group game - but what they have also done each time is go on to win their group. One change I can see happening is at left-back, with Nico O'Reilly coming back in for Djed Spence. O'Reilly got in some great positions, offered more on the ball and was also very unlucky when his header hit the bar.