Dortmund and Monaco prepare for quarter-final goalfest

FILE PHOTO: Football Soccer - Borussia Dortmund v Benfica - UEFA Champions League Round of 16 Second Leg - Signal Iduna Park, Dortmund, Germany - 8/3/17 Borussia Dortmund's Pierre-Emerick Aubameyang celebrates scoring their third goal with team mates Reuters / Wolfgang Rattay Livepic

(Reuters) - Despite their attacking qualities, Borussia Dortmund and Monaco face similar concerns as they prepare for Tuesday's Champions League quarter-final first leg, with both having their defensive frailties brutally exposed in recent weeks.

No side had ever advanced through a knockout tie conceding six goals but swashbuckling Monaco threw caution to the wind to oust Manchester City, netting three away goals in a 5-3 defeat in the first leg before running out 3-1 winners at home to advance on away goals.