The January transfer window closes across Europe's top leagues on Friday, giving clubs one last day to shape their squads for the remainder of the season.
The month has already featured a number of significant moves. Dortmund landed Erling Haaland from RB Salzburg and has reaped the benefits with his five goals in 59 minutes of action across his first two appearances.
In another marquee move, Manchester United has secured the signing of Portuguese attacking midfielder Bruno Fernandes after a protracted saga that finally was completed on Thursday.
Tottenham has been busy remaking its squad, selling Christian Eriksen and loaning out Danny Rose while making Giovani Lo Celso's loan a permanent move and adding Dutch winger Steven Bergwijn.