Arsenal's defence, a topic which has been regularly debated for what feel like decades and it is a department which Arsene Wenger seems reluctant to strengthen on a regular basis.
Laurent Koscielny has been the standout figure at centre-half in recent seasons, however, this campaign both Gabriel Paulista and Per Mertesacker have struggled to match the Frenchman's standards.
This summer, the club must recruit a fresh face to add competition to these two vital roles and perhaps bring some much needed quality. Here are three options which Wenger should be exploring.
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Kalidou Koulibaly - Napoli
Koulibaly has been one of the standout figures in Napoli's impressive Serie A season. The Senegalese defender has improved drastically and has become a very capable defender.
A towering physical specimen with blistering pace, Maurizio Sarri has instilled some discipline into what was a previously very erratic defender allowing him to become one of the finest players in Italy.
The 24-year-old now has the maturity and calmness required to thrive at the top-level, with his tenacity and physical characteristics an added bonus.
Slowly but surely, the Napoli man is becoming one of the most feared centre-back's in the world and Arsenal would be wise to make an investment sooner rather than later.
Jonathan Tah - Bayer Leverkusen
Defending is an art form which is hard to master at a young age, but 20-year-old Tah has gone some way to quashing that theory this season in the Bundesliga.
The young German has been earmarked as the future of the country on an international level and he has helped Leverkusen achieve a third-place finish, ensuring Champions League football for the club.
A defender with outstanding maturity for someone so young, pragmatic intelligence and calmness on the ball, Tah has all the attributes to become the complete defensive package.
Germany has a knack for producing some pretty decent defenders and Wenger would be wise to, at the mimimum, look into their latest prodigy.
Eric Bailly - Villarreal
Spanish side Villarreal seem to regularly produce some fine young defenders and they may have unearthed another gem this season in the form of Bailly.
The 22-year-old Ivorian has featured heavily for the club this season, helping them gain Champions League football in what has been a fiercely competitive La Liga this season.
The pacey centre-back has perhaps not had as finer season as either Koulibaly or Tah, but all the signs are there that he could become a top defender.
Far from the complete package, Bailly would require some nurturing if he were to make the move but perhaps the Villarreal man would thrive playing alongside the likes of Koscielny and Mertesacker, players who could help him become a defensive leader.
What players do you think Arsenal will sign in the upcoming transfer window? Have YOUR say in the comment box below!