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.
25 September
English Football League
Leon Clarke [Sheffield United - Shrewsbury] Free
Bobby Duncan [Fiorentina - Derby] Undisclosed
Gareth Evans [Portsmouth - Bradford] Free
Nicholas Ioannou [APOEL - Nottingham Forest] Undisclosed
Brennan Johnson [Nottingham Forest - Lincoln] Loan
Alfie McCalmont [Leeds - Oldham] Loan
Barrie McKay [Swansea - Fleetwood] Loan
Jerome Opoku [Fulham - Plymouth] Loan
Kyle Taylor [Bournemouth - Southend] Loan
Ben Watson [Nottingham Forest - Charlton] Free
International
Luis Suarez [Barcelona - Atletico Madrid] Undisclosed
Florent Hadergjonaj [Huddersfield - Kasimpasa] Undisclosed
Mbwana Samatta [Aston Villa - Fenerbahce] Loan
24 September
Premier League
Diego Llorente [Real Sociedad - Leeds] Undisclosed
Edouard Mendy [Rennes - Chelsea] Undisclosed
Dale Stephens [Brighton - Burnley] Undisclosed
English Football League
Hakeeb Adelakun [Bristol City - Hull] Loan
Jake Beesley [Solihull - Rochdale] Undisclosed
Rhys Fenlon [Burnley - Accrington] Free
Steve Seddon [Birmingham City - AFC Wimbledon] Loan
International
Aaron Hickey [Hearts - Bologna] £1.5m
23 September
Premier League
Nelson Semedo [Barcelona - Wolves] £27.6m
English Football League
Scott McKenna [Aberdeen - Nottingham Forest] Undisclosed
Rasmus Nicolaisen [FC Midtjylland - Portsmouth] Loan
Jayden Richardson [Nottingham Forest - Forest Green] Loan
Yann Songo'o [Scunthorpe - Morecambe] Free
22 September
English Football League
Harry Arter [Bournemouth - Nottingham Forest] Undisclosed
Idris El Mizouni [Ipswich - Cambridge] Loan
Luke Garbutt [Everton - Blackpool] Free
Lewis Gibson [Everton - Reading] Loan
Liam Gibson [Unattached - Morecambe]
Jordon Ibe [Bournemouth - Derby] Free
Mark McGuinness [Arsenal - Ipswich] Loan
Tom Sang [Cardiff - Cheltenham] Loan
International
Leo Bonatini [Wolves - Grasshopper Club Zurich] Loan
Alvaro Morata [Atletico Madrid - Juventus] Loan
Alexander Sorloth [Crystal Palace - RB Leipzig] Undisclosed
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