The window, delayed because of the impact of the coronavirus pandemic, is also set to include a domestic-only period for transfers between Premier League and English Football League clubs from 5-16 October.
For all of the latest rumours, check out today's gossip column and for a full list of the August transfers visit this page.
21 September
English Football League
Mikel San Jose [Athletic Bilbao - Birmingham] Free
20 September
Premier League
Cengiz Under [Roma - Leicester] Loan
19 September
Premier League
Gareth Bale [Real Madrid - Tottenham] Loan
Ki-Jana Hoever [Liverpool - Wolves] £9m
Diogo Jota [Wolves - Liverpool] £41m
Sergio Reguilon [Real Madrid - Spurs] Undisclosed
Bertrand Traore [Lyon - Aston Villa] £17m
English Football League
Chuba Akpom [PAOK - Middlesbrough] Undisclosed
Carel Eiting [Ajax - Huddersfield] Loan
International
Taiwo Awoniyi [Liverpool - Union Berlin] Loan
18 September
Premier League
Thiago Alcantara [Bayern Munich - Liverpool] £20m
Scottish Premiership
Craig Bryson [Aberdeen - St Johnstone] Free
Robbie Crawford [Livingston - Motherwell] Loan
English Football League
Nathan Cameron [Macclesfield - Wigan] Free
Cyrus Christie [Fulham - Nottingham Forest] Loan
Sam Finley [Accrington - Fleetwood] Free
Joel Grant [Plymouth - Swindon] Free
Jack Sowerby [Fleetwood - Northampton] Undisclosed
Shilow Tracey [Tottenham - Shrewsbury] Loan
Bradley Webb [Bristol City - Newport] Loan
International
Lewis Baker [Chelsea - Trabzonspor] Loan
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