Defender Winston Reid has signed a new long-term contract with West Ham which commits him until the summer of 2021.
Blackburn have signed defender Doneil Henry on a month's loan from West Ham.
Bradford have signed Derby defender Tom Naylor on loan for the next two months.
The 21-year-old, who moved to Derby last season from non-league Mansfield, has joined Phil Parkinson's side until January 12.
Naylor is expected to go straight into the Bradford squad for their home game against Exeter on Saturday.
Derby manager Nigel Clough told the club website: "This is a good chance for Tom to get some first-team games under his belt, which is something we've not been able to offer him so far this season.
"He's been playing in the under-21s regularly but first-team football is something you can't replicate so this is a chance for him to go and experience regular football for the next eight weeks or so."