The midfield and back four are simply not an effective defensive unit.
Times, Sunday Times
We fully understood what we needed to do as a defensive unit.
The Sun
They have played some excellent football, but they have also looked far more assured as a defensive unit than they have for several seasons.
Times, Sunday Times
Their defensive unit must remain tight and switched on at all times.
The Sun
It relies heavily on the opposition ball being so slow that the defensive unit can align itself and target the opposition.
Times, Sunday Times