Argentina's Enzo Fernandez joined Chelsea from Benfica in the January 2023 window for a British record £107m.
The transfer window shuts at 23:00 GMT on Thursday, and January spending levels are significantly down on previous seasons.
Only 15 players have been signed by Premier League clubs in January, with 10 permanent transfers, five loan deals, and disclosed fees of about £50m.
The lack of movement in the transfer market can be attributed to the Profit and Sustainability Rules (PSR) and the reluctance of super clubs in Europe to spend.
Loan deals have become more prevalent due to PSR and the higher wages in England.
The days of £100m transfers may be over, with clubs expected to have a period of increased spending followed by two years of restraint.
Deadline day often brings a flurry of activity, with Chelsea and West Ham among the clubs potentially making high-profile sales or signings.
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