Our midfielders are a bit too injury prone. Numbers wise we have plenty, so if somebody comes in in January, somebody else should go (Keita or Ox, basically. Possibly even Milner in fact, much though I like him).
An alternative would be that we sign a good backup RB, and then we could use Trent as midfield cover in a moment like now when we have a lot of guys out. To be fair to Neco Williams, he has done pretty well in his recent outings. If Fab and Thiago are still out, I'd be inclined to try out Trent in MF now with Neco at RB, see how both get on. Pretty sure Trent can do a job in MF, maybe a very good one. If Neco can't do a job at RB, then we need to sign a RB anyway in my opinion, more urgently than a midfielder, and it would kill that second bird with the one stone.