Defender Ritchie De Laet joined Portsmouth until the end of the season, with midfielder Corry Evans - the younger brother of Red Devils defender Jonny - moving to Hull City.
"De Leat's a very flexible defender who can play across the back four. The defence was an area we needed to strengthen, so I'm delighted," said the Pompey boss Steve Cotterill.
Evans is not the only Manchester United player to move to East Yorkshire this season, with the Tigers also extending the loan of forward Cameron Stewart.
Crystal Palace have signed forward Jermaine Easter, and he will make his debut for them against Swansea City on Saturday - having been training with the Swans until Thursday.
Easter was on loan at the Liberty Stadium from MK Dons, but was recalled before completing a quickfire move to Selhurst Park.
"The move was done very quickly. There was interest in the summer but it didn't come about and I've been on loan since deadline day in November, it's definitely a bit of a weird one," he said.
"It's a different pressure to at Swansea but at the end of the day it's about winning football matches wherever you are in the league. It's a competitive league and I'm sure we've got enough to kick-on."
Nottingham Forest have been granted a work permit for the American striker Billy Findlay, although he must wait before getting a visa from his home country before signing for the club.
Chris Powell has left his role as first-team coach at Leicester City to become manager of the League One side Charlton Athletic.
Leeds United have re-signed defender George McCartney on loan from Sunderland.