#2 Fullbacks offered nothing
While Luiz made the highlighted mistakes, blaming him solely is not correct at all. The truth was, the entire Chelsea back-line was in shambles at Wembley. A major reason for this was the incompetent performance of the two fullbacks, Cesar Azpilicueta and Marcos Alonso. A lot of Chelsea fans want upgrades in these positions, and the reasoning behind their wish was visible clearly at Wembley.
Both were constantly caught out of position, and left too much space for the center-backs to cover. While Azpilicueta registered a late assist, the truth was neither offered anything going forward for large periods of the match. Both fullbacks never attempted to take on players on their flanks and put crosses into the box. As a result, Chelsea had no width or penetration in their attacking play.