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.
17 September
Premier League
Conor Gallagher [Chelsea - West Brom] Loan
International
Benik Afobe [Stoke - Trabzonspor] Loan
English Football League
Simeon Akinola [Barnet - Southend] Free
Josh Eccles [Coventry - Gillingham] Loan
Liam Feeney [Blackpool - Tranmere] Loan
Jonathan Grounds [Unattached - Swindon]
Tom James [Hibernian - Wigan] Loan
Alan McCormack [Unattached - Southend]
Jack Roles [Tottenham - Burton] Loan
Indiana Vassilev [Aston Villa - Burton] Loan
16 September
Premier League
Emiliano Martinez [Arsenal - Aston Villa] £17m
Scottish Premiership
Stephen McGinn [St Mirren - Hibernian] Free
English Football League
George Hirst [Leicester - Rotherham] Loan
Scott Hogan [Aston Villa - Birmingham] Undisclosed
Kamil Jozwiak [Lech Poznan - Derby] Undisclosed
International
Joel Asoro [Swansea - Genoa] Loan
Pervis Estupinan [Watford - Villarreal] £15m
Joel Valencia [Brentford - Legia Warsaw] Loan
15 September
English Football League
Daniel Ayala [Middlesbrough - Blackburn] Free
14 September
English Football League
Abdoulaye Diallo [Genclerbirligi - Nottingham Forest] Undisclosed
Michael Jacobs [Wigan - Portsmouth] Free
Thomas Mayer [SC Austria Lustenau - Hull] Free
Kaiyne Woolery [Swindon - Tranmere] Free
13 September
International
Boli Bolingoli [Celtic - Istanbul Basaksehir] Loan
12 September
Scottish Premiership
Zdenek Zlamal [Hearts - St Mirren] Short-term loan
English Football League
Daniel Csoka [Wolves - AFC Wimbledon] Free
Josh Lillis [Rochdale - Barrow] Free
Ethan Walker [Preston - Carlisle] Loan
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