Arsenal play host to Chelsea at the Emirates Stadium in a Premier League encounter that will more or less be a decider that determines whether the hosts will qualify for the Champions League next season.
If Unai Emery's men drop any points against their London rivals, they can wave goodbye to finishing in the top-four, and will instead have to concentrate on winning the Europa League to get into Europe's top competition.
Here are three things to watch out for as the Gunners host the Blues:
3. Bellerin and Monreal Return
Hector Bellerin and Nacho Monreal could return to the starting lineup for this game, with the Gunners especially missing the former on the right side.
Manager Unai Emery has used a combination of Stephan Lichtsteiner and Ainsley Maitland-Niles on that side, but neither have shown they are capable of replacing Bellerin's qualities on the right.
Monreal will add some much needed stability and experience at the back if he is fit to start and Emery would be hoping his countryman is able to play a part from the beginning of the match.
2. Hazard to Continue as False Nine
Chelsea head coach Maurizio Sarri has no choice but to play Eden Hazard as a false nine again, especially considering that Alvaro Morata could be on his way out of the club and Olivier Giroud has not been in great form.
Even if he had been available, Morata has not shown any efficiency in front of goal. Giroud meanwhile, has a slight ankle problem but is raring to go against his former club. However, it is unlikely Sarri will start Giroud for this game.
The coach has said that playing Hazard as the striker gives his team more stability in other areas, and so that will continue till they sign a new striker.
1. Top-four Race Intensifies
It is a three-way race for the top-four once again with the only difference being this time Manchester United are the ones involved along with Arsenal and Chelsea.
The Gunners need the win in this game, else they will fall behind in their quest to qualify for the Champions League. Anything less than a win would be catastrophic for their chances.
The Blues sit four points ahead of their opponents but can increase their lead to nine if they get the win.
Here are three things to watch out for as Arsenal host Chelsea in the Premier League