Chelsea centre-back Kadeisha Buchanan is out with an anterior cruciate ligament (ACL) injury, so manager Sonia Bompastor will be keen to bring in a replacement. The WSL leaders were looking for a midfielder in the summer too. Meanwhile, captain Millie Bright has been in discussions over a new deal. Erin Cuthbert and Buchanan are also players the club want to sign new deals.
Manchester City have injuries at centre-back and up front so may look to add reinforcements. City have already secured an important contract extension for full-back Kerstin Casparij.
The main priority for Arsenal is settling on a permanent manager with interim boss Renee Slegers impressing and putting herself in prime position for the role. As well as potential interest in Walsh and the probable departure of Kuhl, Arsenal are in need of defensive reinforcements.
Manchester United were busy in the summer and manager Marc Skinner says he is happy with his squad; but, if Ladd leaves, there may be room for more additions. United also need to agree contract renewals with Jayde Riviere and Grace Clinton, among others.
It was a very successful window for Brighton this summer and it has paid off with results - but manager Dario Vidosic has not ruled out more activity in January, saying they will seek to add quality to the squad if it becomes available.
Tottenham's priority is a goalkeeper having spent the majority of the summer looking at options. Falk is among those they have looked at and Spurs have also enquired about attacking midfielders.
It has been a turbulent few months at Aston Villa as they spent money in the summer, backing new manager Robert de Pauw, only to sack him six months later. They now need to find a replacement, while addressing expiring contracts for senior players including Rachel Daly, Jordan Nobbs and Dan Turner.
Liverpool manager Matt Beard hoped to add more reinforcements but a tight budget means he is likely to bring in just one player, unless the club sell to generate funds. As well as Nagano's contract expiry, Wales international Ceri Holland and defenders Taylor Hinds and Grace Fisk are among those with deals ending in 2025.
It is expected to be a busy month for Everton, who desperately need squad depth and hope to have money available following the club takeover. No outgoings are expected as things stand and they have already signed France forward Kelly Gago.
West Ham are in a fairly good position given their financial constraints. Manager Rehanne Skinner will need to be shrewd again to bring in players to add depth.
It has been a difficult few months for Leicester City because of an injury crisis, so they are likely to be active in January. Attacking additions and some experienced players could be on the wishlist.
Bottom club Crystal Palace need to be smart in the transfer window as they are unable to compete financially. They have lacked goals so might add attacking firepower, while they missed out on a few defensive targets in the summer that they may return to.