By using a very slow build-up play (which we do) and barely any counter-attack, it takes our 2 attacking wingers largely out of the game. Pepe and Krasic both have pretty good pace. Because we short pass and lob it around, the defence moves in, zone marks, and is then comfortable with covering either Pepe or Krasic.
If we were to play a faster game (which would be playing to our strengths), our wingers can move around quicker with give and gos, line runs, overlaps, etc.
It's not possible now, hence why they are always covered and have to play the ball back to Lichtsteiner, Chiellini, or a Centre Mid.