The summer transfer window in 2023 opened on Wednesday, June 14, and closed on Friday, September 1, 2023, at 23:00 BST for the Premier League and most major European leagues. Clubs had until 23:00 BST on September 1 to complete signings, with a two-hour extension to submit deal sheets for signings, while the FIFA Transfer Matching System deadline was midnight. Other European leagues had similar closing dates, with some variation in exact closing times. For example, Germany closed earlier at 17:00 BST, and the window in Belgium lasted until September 6. Outside Europe, leagues like the Saudi Pro League had different closing dates, such as September 20, 2023.