Ousmane Dembele is likely to join a Premier League club if he moves on this window, which would have an impact on Arsenal.

Reports in the last couple of days have suggested that Barcelona have an agreement with Pierre-Emerick Aubameyang for a loan deal until the summer. But it can only happen if Ousmane Dembele moves on too.
Barcelona will be unable to afford to register Aubameyang without Dembele’s departure, so Arsenal will be keeping a close eye on any developments.
Lyall Thomas of Sky Sports reports that Dembele is most likely to join a club in the Premier League if he leaves Barcelona before Monday’s deadline. His agents are hard at work on a solution.
The Daily Mail report that Dembele is available for £18m, and his representatives are focusing on two Premier League clubs in particular. Neither have been named at this stage.
The simplest solution would be a simple swap with Dembele joining Arsenal and Aubameyang joining Barcelona, removing the complications of a third party. But there’s no suggestion the Gunners are actually interested in the winger.

If Dembele doesn’t move on, it seems increasingly likely that Aubameyang won’t either.
It’s not ideal, but in that case, Arsenal may have to come to terms with the possibility that reintegrating Aubameyang is their best option.