If Arsenal were not concerned about their two goal lead before, they certainly are now following Barcelona’s extraordinary collapse at the hands of Liverpool.
The Reds came from 3-0 down to win 4-3 and ultimately knock out the La Liga champions of the competition.
The Gunners currently lead the Spanish side 3-1 win.
Like Liverpool, Valencia, who are at home in the second-leg of the Europa League semi-final on Thursday, will also have to overcome the odds if they are to progress.
After the game at Anfield, Valencia’s English language Twitter account wrote: ‘So, it CAN be done…’ with a ‘fingers crossed’ emoji.
Arsenal fans will be hoping for the opposite, as they bid to reach the final in Baku.
Emery’s men must produce a Europa League triumph if they are to qualify for Champions League football next season.
Score predictions, Gooners? Let us know what you think in the comments…