However, there is an additional domestic-only period for deals, when Premier League clubs can trade with EFL clubs, which expires at 17:00 BST on 16 October.
Manchester United completed our first signing of the window on 2 September, when Donny van de Beek's arrival from Ajax was confirmed.
The 23-year-old midfielder signed a five-year-deal with the Reds, with the option to extend for a further year, after scoring 41 goals in 175 appearances for his boyhood club.
Alex Telles was then announced on 5 October, with the Brazil international joining from Portuguese champions FC Porto, followed by the announcement that Amad Traore is to join in January from Atalanta.