I have never seen Robertson struggle as much as he did against Gnabry over both the legs. Not all of it could be attributed to our tactics of moving our fullbacks forward. Most of it, especially at Anfield, Gnabry just went past Robbo like he didn't exist. It's really worrying considering some of the giants waiting in the CL on that right wing.
Also despite us winning, Trent was very poor against Ribery. Not sure how many left wingers will have Ribery's tricks, but still it was too easy to break free of Trent. Even against Burnley and Watford, Trent's defensive work was questionable. Early in the season, against more attacking wingers, Klopp used Gomez instead of Trent.
Our Full backs situation is probably the most concerning in our squad.