Arsenal were among the busiest Premier League clubs during the summer transfer window, but their spending might not quite be over.
The Gunners spent close to £150m in the close-season, strengthening their back-line with the likes of Aaron Ramsdale and Ben White and turning Martin Odegaard's loan move from Real Madrid into a permanent switch.
After a slow start to the season, manager Mikel Arteta has turned things around and led his team to fourth place at the turn of the year, but there are still a few kinks to iron out.
The biggest question mark concerns the future of Pierre-Emerick Aubameyang, who has been stripped of the captaincy after a disciplinary breach and will have gone more than a month without a Gunners appearance by the time he returns from Gabon duty at the Africa Cup of Nations.
It might not be a window of major surgery, but there are still issues to resolve, and Mirror Football has looked at the best-case and worst-case scenarios for Arteta's team.
Join the debate! Who should Arsenal sign and sell in January? Have your say in the comments section here.
The best case
Based on the way Arsenal have performed without Aubameyang in the side, the ideal January would probably involve the Gunners selling their former captain.
A move to Barcelona had been suggested, but the Catalan club may now consider him surplus to requirements after signing Ferran Torres and reportedly making advances for Alvaro Morata.
If Arsenal are able to shift the striker, though, then a good window would require a replacement being found.
Everton and England striker Dominic Calvert-Lewin continues to be linked with a move, which would allow him to revive his international relationship with the likes of Ramsdale and Bukayo Saka, while Fiorentina's Dusan Vlahovic is on the radar of Arsenal - among other English clubs - after turning down a new deal in Tuscany.
Aubameyang is one of a number of players leaving north London for up to a month at AFCON, with Thomas Partey and Mohamed Elneny leaving the midfield light with their departures.
The best option may be someone who provides a combination of youth, quality and Premier League experience, and Renato Sanches ticks all of those boxes.
The Lille midfielder reportedly has a gentleman's agreement to leave the French club, and could provide cover in January and competition beyond then.
The worst case
Considering the number of solid summer additions, the worst case scenario would involve Arsenal spoiling what they have built in the first half of the season.
Philippe Coutinho has been linked with the London club once more as Barcelona attempt to trim their wage bill, but the Brazilian could end up representing all that the Gunners thought they had left behind.
Willian's departure has been a blessing in disguise, allowing Arsenal to find room for three of Saka, Odegaard, Emile Smith Rowe and Gabriel Martinelli, and the arrival of another high earner would run the risk of disrupting the harmony.
Further forward, with Aubameyang out of favour and Alexandre Lacazette and Eddie Nketiah out of contract in the summer, Arsenal run the risk of being left light up top if they allow the two older players to leave without completing a deal for a suitable replacement.
A failure to add midfield reinforcements wouldn't be the end of the world, with the absence of Arsenal's AFCON-bound players only temporary, but reliance on a double pivot of Granit Xhaka and Albert Sambi Lokonga could be an issue - especially if Ainsley Maitland-Niles is allowed to leave on loan, with Roma and Everton interested.
The biggest issue, though, will be keeping the current starters fit, healthy and happy in an effort to ensure Arsenal can build on a strong start, while potentially shifting some of the deadwood.
Considering where the club were 12 months ago, that's already some achievement.
