Scotland have two top-class left backs in their squad and their manager wants them both in his team.
The way Steve Clarke does that is by using Kieran Tierney on the left of the back three and Andy Robertson at left wing-back.
The news that Tierney should be fit to start is massive for Scotland. Before this tournament began, they drew 2-2 with Holland and Tierney and Robertson could be seen rotating in that warm-up match.
Having both Kieran Tierney (left) and Andy Robertson (right) in the Scotland team can cause huge problems for England in their Euro 2020 clash at Wembley Stadium on Friday night
England must be wary of the pair's ability to create chances as they welcome Scotland
Sometimes it would be the man from Arsenal flying forward down the left, and sometimes it would be the man from Liverpool.