28-year-old Cardiff City striker Adam Le Fondre moved across the division from Cardiff City to Bolton Wanderers on loan for the remainder of the season.
Neil Lennon's improving side come to the City Ground on 21 February.
Leeds have added two players from Palermo to their squad as they bid to avoid a relegation battle. French midfielder Granddi Ngoyi and ex-Leicester defender Sol Bamba are with the club until the summer.
And Wigan Athletic, currently in the bottom three, have snapped up Aston Villa midfielder Chris Herd, again until the end of the current campaign.
The Latics come to Nottingham on 11 February for a league fixture.