Rotherham are unlikely to make any more signings before the end of the month, according to manager Steve Evans.
Derby captain Richard Keogh has agreed a new three-year contract with the Sky Bet Championship outfit.
Manchester United boss Sir Alex Ferguson says there is no value in the January transfer window and has ruled out any new signings in the new year.
With all teams in the Premier League chasing the tails of leaders United, as well as battling the drop, there is likely to be plenty of money exchanging hands next month.
Ferguson has generally been reluctant to conduct any winter business, although Patrice Evra and Nemanja Vidic arrived in 2006 and keeper Anders Lindegaard the only high-profile Christmas signing (2011) since then.
When asked if there were areas of his squad he wanted to strengthen, Ferguson told Eurosport-Yahoo!: "No. The January transfer market has never been the best market and that has proved itself over the years.
"You get very few big transfers - all the big transfers are done in the summer."
One acquisition during the summer that continues to delight Ferguson is striker Robin van Persie.
A haul of 15 goals in 21 games in all competitions since his £24m move from Arsenal has helped his side open up a six-point gap at the Premier league summit.
With Eric Cantona's arrival from Leeds in 1992 inspiring the team to four league titles, Ferguson feels Van Persie can act as a similar catalyst to success.
"I think it is happening. The attacking aspect of our game has definitely improved," Ferguson added.
"He has a similar profile to Eric. There is a maturity about him. He had a great spell at Arsenal so there was no issue with him going from one big club to another. He's an established international and his profile suited us perfectly."
Although striker Wayne Rooney and Van Persie have started most of the games this season, Ferguson was in no doubt that having fellow-forwards Danny Welbeck and Javier Hernandez in the squad was vital.
"Having four is a definite advantage," said Ferguson, whose team won the treble in 1999 with an attacking quartet of Dwight Yorke, Teddy Sheringham, Ole Gunnar Solskjaer and Andy Cole.
"It is difficult to manage but they didn't complain too much back then as long as they got their share of playing and they all made their contribution.
"Hopefully this will apply with the players again. But they will all contribute this season - there is no question about that."