What happens during a transfer window? And are there any rules?
Briefly

The January transfer window allows Premier League clubs to make strategic player moves to enhance their squad's performance for the remainder of the season.
Transfer windows enhance contractual stability, preventing destabilizing deals during the season while enabling managers to plan for the future without unexpected departures.
The profit and sustainability rules restrict Premier League clubs from incurring excessive losses over a rolling three-year period, ensuring financial responsibility.
Clubs must ensure their squad lists comply with the regulations, limiting them to 25 players with a required number of homegrown talents.
Read at www.bbc.com
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