3. Key returns a big boost

The trip to Paris could see two key players return to the Arsenal side, something that Arteta will be very happy to see heading into the tie.
Jurrien Timber was withdrawn with injury in the first-leg and subsequently missed the weekend's defeat to Bournemouth, but there is a possibility he could come back in at right back tomorrow night. The Dutchman was spotted in training earlier in the day and while there is no official confirmation he will make the starting XI, that seriously increases the hopes.
Thomas Partey was absent from last week's defeat to PSG after picking up a suspension against Real Madrid. His presence was very much missed at the base of midfield as Declan Rice was made to play a more defensive role while makeshift striker Mikel Merino had to drift back into the number eight position.
The Ghanaian is practically guaranteed start in the French capital while Timber is likely to also be involved. The return of this pair will be huge for the Gunners and the solidity they both offer the side will certainly increase the hopes of making a comeback at the Parc des Princes.