The central defender was regular at Portman Road up until mid-December, and is hoping his move to Elland Road can help both him and Leeds' promotion push from League One.
"The main thing is helping us win some games and get up the table.
"We have to string some wins together and get up the league."
Leeds boss Simon Grayson said: "He's a good, strong centre-back and has got plenty of experience.
"He's played plenty of games in the Championship this season. He will bring a wealth of experience and he brings a lot that I believe will help."
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