The January transfer window is always a difficult one to negate for any club.
Transfer fees are inflated and given that teams across Europe are halfway through their domestic season, few are keen to offload any players of worth.
However, that doesn't mean smart business cannot be done and in the case of Arsenal, that has happened on more than one occasion.
Below, we've taken a look - and then ranked - all of the Gunners' 21 signings in January since the end of the 2002/03 season.
You'll never guess who's at number one...
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21. Thomas Eisfeld (2012)
The talented midfielder from Borussia Dortmund's academy never made a senior appearances for the Gunners, before a short and unsuccessful spell at Fulham confirmed he just wasn't cut out for English football.
He's now with VFL Bochum in Germany's second tier.
20. Cohen Bramall (2017)
A truly baffling signing to this day. Arsenal spent £40,000 to bring in the left-back from non-league Hednesford Town and no one could understand why.
Unsurprisingly, Bramall never turned out for Arsenal's first team and he's now with Colchester United on a permanent basis.
19. Wellington Silva (2011)
The last player on this list to have never made a senior appearance for the Gunners. Signed for just over £3m from Fluminense, Silva was loaned out six times by Arsenal, which included a stint with Bolton Wanderers.
He's now on loan again at Internacional after re-joining Fluminense in 2016.
18. Ryo Miyaichi (2011)
'The Japanese Messi' and 'Ryodinho' were two nicknames that followed the early stages of Miyaichi's career, but people sadly jumped the gun.
The now 27-year-old never started a game for Arsenal and he's been at German side St Pauli since 2015, where he's spent a lot of his time playing for their second team - ouch.
17. Denis Suarez (2019)
What a disaster. Unai Emery was desperate to land the Spaniard to bolster his midfield options, but it all went wrong very quickly.
Four woeful cameos were then followed by Suarez's loan spell coming to an end prematurely through injury.
16. Kim Kallstrom (2014)
Imagine signing a player on loan to cover for injuries, only for the new arrival to be ruled out for three months himself. Classic Arsenal.
The only reason he's above Suarez is because of his penalty in the shootout against Wigan in the FA Cup semi-final!
15. Krystian Bielik (2015)
Never got a chance in the Arsenal first-team despite impressing on loan at Charlton Athletic, but he did what few other have done on this list - he made the Gunners a tidy profit.
Originally signed for £2.4m from Legia Warsaw, Bielik was sold to Derby last summer for around £10m.
14. Konstantinos Mavropanos (2018)
There is plenty of time for the Greek to elevate himself higher up the list, but the initial signs haven't been promising.
Aside from a decent display away at Manchester United in 2018, Mavropanos has pretty much been permanently on the treatment table, which is a seriously worrying sign for the 22-year-old.
13. Carlos Vela (2006)
Things just didn't really work out for Vela at Arsenal, but the Mexican has proven he's a quality player with his goal-laden spells at Real Sociedad and Los Angeles FC.
He only managed three in his 29 Premier League appearances for the Gunners...
12. Henrikh Mkhitaryan (2018)
Part of the swap deal which saw Alexis Sanchez join Manchester United, which ended up being pretty disastrous business for both parties.
Mkhitaryan provided a few moments of quality, but like his spell with United, he just couldn't adjust to the robust style of English football. AS Roma will likely make his loan move permanent in due course.
11. Mohamed Elneny (2016)
Signed from Basel for around £5m, Elneny was certainly a decent - and versatile - player at times, but was just not at the level required for Arsenal.
The Egyptian will surely depart on a permanent basis after his season-long loan at Besiktas comes to an end.
10. Thierry Henry (2012)
Okay, we're just a sucker for nostalgia here, but how can you not love Henry's return to Arsenal on loan?
That goal against Leeds in the FA Cup and his winner away at Sunderland saw him sign off from Gunners duty forever on the highest of notes.
9. Gabriel Paulista (2015)
A player who was probably sold too hastily, but Arsenal rarely make the correct decision about anything to do with their defence.
The fiery Brazilian was far from perfect, but his form with Valencia over the past few seasons has been a downside better than a number of the Gunners' current centre-backs.
8. Andrey Arshavin (2009)
Everyone wanted Arshavin after his performances at Euro 2008 and his first six months at Arsenal proved why people were jealous that the Gunners had got the deal over the line.
Four goals at Anfield and his winning goal versus Barcelona will live long in the memory, but fans weren't exactly sad to see the back of him when he returned to Zenit in 2013.
7. Emmanuel Eboue (2006)
There were numerous mistakes and a cameo against Wigan that will forever be in the Premier League's 'hall of shame', but there was a lot of good about Eboue at Arsenal.
Versatile, always committed to the cause and a hugely popular figure in the dressing room, the Ivorian is a bit of a Gunners legend in his own right.
6. Abou Diaby (2006)
Injuries curtailed what would have been a brilliant career, but even with his plethora of knocks, muscle tears and serious injuries, Diaby turned in some great displays for the Gunners.
Whenever he got going, he was the spitting image of Patrick Vieira and his name deserves more respect.
5. Theo Walcott (2006)
Before his serious knee injury sustained against Tottenham in the 2013/14 FA Cup, few wingers in world football were as dynamic as Walcott.
Scoring 108 goals and providing 78 assists in 399 games is a seriously impressive return and some may not like to admit it - but Walcott is one of the most underrated signings in Arsenal's history.
4. Emmanuel Adebayor (2006)
To put it simply, Adebayor was electric at Arsenal and he never really recovered that form after his move to Manchester City.
The Togolese striker scored 62 goals in 146 games for the Gunners, including a stunning volley in the north London derby against Tottenham.
3. Jose Antonio Reyes (2004)
When you score an absolute worldie against Chelsea on your debut, you know you'll be an Arsenal legend forever.
The electric winger scored 23 goals and provided 24 assists in 110 games and will forever be remembered for his contribution to the Invincible side of 2003/04.
2. Nacho Monreal (2013)
An Arsenal cult hero and the easily club's best left-back in the post-Ashley Cole era - and he only cost £8.5m!
Monreal was the definition of 'dependable' during his six-year stint in north London and he's still performing to a high level out in Spain with Real Sociedad. Maybe Arsenal sold him a little too early...
1. Pierre-Emerick Aubameyang (2018)
Who else was it going to be, eh? The Gabonese striker has been worth double the £56m investment Arsenal made, scoring goals for fun in England's top-tier.
Sadly, Arsenal may struggle to keep the 30-year-old this summer without Champions League football.
Some absolute stinkers, but a surprising amount of success from Arsenal's January transfer business over the past 17 years.
But it will take one of the greatest purchases in Premier League history to ever knock Aubameyang off of top spot.News Now - Sport News