#2 Competition from stronger teams
Even if Arsenal were to overcome Milan in the Round of 16, they will face increased competition from the stronger European sides in the latter stages of the tournament.
Atletico Madrid, Lazio, Lyon were drawn up favourable fixtures and Borussia Dortmund, one of the favourites, will fancy their chances of progressing against a competitive Salzburg side.
Other than this either Marseille or Athletic Bilbao and RB Leipzig or Zenit St.Petersburg will be progressing onto the quarterfinals.
In the past, the Gunners have always faltered against the bigger teams in the Champions League knockout stages.
They have failed to qualify beyond the Round of 16 in their previous seven UCL seasons.
Edited by Alan John