Sheffield Wednesday have signed striker Lucas Joao from Portuguese Primeira Liga side Nacional.
Barnsley have signed Arsenal playmaker Dan Crowley on a half-season loan.
Watford have signed West Brom midfielder George Thorne on loan.
The 20-year-old has agreed a switch to Vicarage Road until January 2 although the Baggies have a recall option after the first 28 days.
Albion hope the move to the Sky Bet Championship club will give Thorne the chance to build up his match fitness after a long-term knee injury.