Read an interesting analysis on twitter about Liverpool's tactical changes in pre-season so far. They had normally Henderson playing in the right sided CM, he would cover that side when TAA or Salah went out of position. Mac Allister so far has been more centrally, either by instruction, or he's just not used to the setup yet. Unless Mac Allister starts covering it like Henderson did, it will mean either TAA can't get forward as much, or Salah will have to defend more often. and deeper. So either way, it will mean TAA or Salah being further from goal and less of an attacking threat.