One of the features of Ange Postecoglou's tactical system has been the use of inverted full-backs.

Once again this was in evidence as Celtic picked up their first domestic away win since February by beating Aberdeen 2-1 at Pittodrie. 

But how exactly did Anthony Ralston's inverted role make a difference? What about Postecoglou's well-timed substitutions or Callum McGregor's more advanced position?

Tactics guru Craig Nisbet explains it all in the video below...