There is no doubting the quality that Arsenal have in their squad. This season, Mesut Ozil has started to finally show why he was worth the fee Arsenal paid for him and, along with the form of Alexis Sanchez and emerging talent in Francis Coquelin, the Gunners have been the best Premier League team in 2015.
Meanwhile, Olivier Giroud has had his best season to date in north London, and newcomer David Ospina has offered some much needed stability in the Arsenal goal.
But, despite all this, they still find themselves 10 points, at the time of writing, off top spot. It is, then, obvious that they still need some investment to push on to the next level.
These players have performed well to get Arsenal to this point, but some of them are not quite good enough to inspire the team to the most coveted trophies.
Thierry Henry claimed Arsene Wenger needs to recruit a solid spine to his side if Arsenal are to compete in both the Premier League and the Champions League, so reinforcements could be made in goal, at the back, in midfield and up top.
Four 'top players' would make Arsenal invincible again, according to Jose Mourinho, and while that would appear something of an exaggeration, building a spine as Henry suggests will make them a force to be reckoned with.
But who should Arsenal sign for these four positions? Here are some suggestions.
Click BEGIN SLIDESHOW to see the choices.
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