Chelsea’s capture of Christian Pulisic from Borussia Dortmund for £58million has been the biggest deal of the January window so far.
However, the American forward has been loaned back to the Bundesliga club for the remainder of the season.
The Blues have also been heavily linked with a move for Gonzalo Higuain in what would be major coup for Maurizio Sarri.
Manchester United, Liverpool and Arsenal are yet to open their cheque books but there is still time for some new arrivals.
Elsewhere in the Premier League Bournemouth have also been busy in the winter transfer market.
The Cherries splashed out £20m to sign striker Dominic Solanke from Liverpool, while also taking Nathaniel Clyne on loan.
Relegation-threatened Fulham have signed former Reds winger Ryan Babel from Turkish side Besiktas in deal reported to be worth £1.8m.
Express Sport has rounded up all the details regarding the dates and times for the January transfer window.
When does the January transfer window close?
Premier League teams have until 11pm on January 31 to complete their transfer business.
Clubs can apply for a short extension if they submit official paperwork before the deadline.
Free agents can be acquired outside of the transfer window period though loan deals cannot.
All professional clubs in England and Scotland must adhere to the same rules to ensure a level playing field.
When does the January transfer window close abroad?
Deadline day varies among the top European leagues, while the Chinese Super League could also pose a threat following the closure of the English window.
Express Sport has rounded up the list of deadline day dates around the leagues:
January 31 – Spain, France, Germany
February 2 – Portugal
February 22 – Russia
July 12 – China
The Italian transfer window closed on January 18.