Having dealt with Swansea City and Brighton & Hove Albion, Arsenal is progressing nicely in the last tournament it has a realistic shot of winning this season.
Because of that, the Gunners ought to prepare for a fight. Manager Arsene Wenger said that his team will prepare for this game as if it were the final.
If Arsenal is to move on, it'll have to take Blackburn seriously, because we all know that lower-tier teams aren't immune to being beaten by Arsenal. Remember Bradford City?
With that in mind, here are some things to watch out for tomorrow.