The Premier League and English Football League summer transfer windows will be open for 10 weeks between 27 July and 5 October, subject to Fifa approval.
In addition, the Premier League and EFL say there will be a domestic-only window between 5-16 October.
“During this window, clubs will only be able to trade with EFL clubs (either loans or permanent registrations),” said a Premier League statement.
“No transfers can take place between Premier League clubs in this period.”
The EFL also said any news signings by its clubs could not play until the start of the 2020-21 season.
“This is applicable to clubs involved in the Championship play-offs,” it said in a statement.
The EFL added: “The window for international registrations closes at 23:00 BST on Monday, 5 October, with an agreement in place with the Premier League for an extended two-week domestic-only window, which will close at 17:00 on Friday, 16 October.”