When it comes to Arsenal there is a lot of talk and debate, between pundits, the media and fans, over what positions exactly the club should be looking to enhance.
For a while it was the goalkeeper spot, but this has now been covered after the deal for Petr Cech went through. Some thought it was absolutely necessary that a second defensive midfielder next to Francis Coquelin should be brought in. The likes of Morgan Schneiderlin and Sami Khedira were linked to the north London side, but Manchester United signed Schneiderlin and Khedira joined Juventus.
Additionally a striker seems to be the most talked about position with a whole host of names being talked about who can step up and complete the jigsaw to lead arsenal to the Premier League title once again.
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However, one more position, that is thought to be a must signing by some, is the centre back position. Last season saw an improvement in the defensive partnership of Laurent Koscielny and Per Mertesacker and it was clear to see that without one of the two, Arsenal began to fall apart with 2 or 3 results not going there way due to this gap in the back line.
For some games it was left to Mathieu Debuchy and Nacho Monreal who are out and out fullbacks to come into the centre and fill in. The reliability particularly on Koscienly, was quite something to the club.
There was an obvious pattern where if he was not in the team, goals were being leaked. Koscielny is thought to be bordering the world class label if not already, and arguably as an individual player's impact on team, earns himself a spot in the top 5 defenders in the world. His starting spot is in contention and surely the French international cannot be replaced any time soon.
As for the 'BFG' himself, Mertesacker has been criticised for being too slow in the modern game but the German has also played his part in an excellent season for the Gunners. The likes of Gabriel and Calum Chambers have the ability to come into the first team and form defensive partnerships but both are yet to retain a starting spot.
Another defender perhaps would do no harm, for one it means that fullbacks will not have to cover if there are any injuries or suspensions and secondly, adding healthy competition to the squad in the battle for a first team place.
Here are 5 centre backs that are available in this summer's transfer window that Arsenal may look into signing.