Arsenal’s heartening win over London rivals Chelsea did have a big setback.

Our defence gave a timely reminder that they can organise themselves into meaningful resistance, our midfield showed they can be useful at both ends of the pitch and our attack proved they can create plenty and be efficient with those chances.

It was the fact that Hector Bellerin was stretchered off and looks to be out for the rest of the season.

The Spaniard has prospered under Unai Emery, and his recent absence was felt in our performances. So his return was looked forward to with earnest by all of us Gooners. So to receive a tear in his quad tendon - which requires a nine month rehabilitation period.

The gory moment the injury occurred has been seen by mostly everyone, and now we must decide whether to soldier on without him and with what we have - or delve into a market where we will be looking for a bargain.

At this moment in time, the choices we have consist of veteran Stephane Lichtsteiner and promising youngster Ainsley Maitland-Niles. Promisingly, Maitland-Niles has come out recently and spoke of his preference to play on the right rather than in central midfield - and it looks like he’ll get his chance.

Lichtsteiner, despite a shaky start to his PL career, is still a dependable defender, but he is now entering the final six months of his one year deal. Inevitably his mind will stray to his immediate future and this could impact displays.

We can adapt and roll with the punches - Granit Xhaka has filled in at RB so far this season - but it may look like Emery might be forced into the market.

Our transfer budget is non-existent, so our club will be scouring the bargain buckets for a player who is established and can add quality - but they’re pretty difficult to find.

Bellerin’s injury has left the door open for someone to stake a claim, but our team will surely be a little weaker without the blistering runs of Bellerin - who has racked up the assists this season.

With just over a week to go until the window closes, only time will tell.