The Black Cats boss wants to bring the 76-times capped Hungary international centre-back to Wearside on loan with a view to a £2.5m permanent deal.
Belgian side Anderlecht have rebuffed interest from Celtic and Rangers in the past, but they are now preparing to let the 29-year-old leave.
O’Neill wants to bring in to reinforce the heart of his defence, with injuries to Wes Brown and John O’Shea, and now Carlos Cuellar, meaning he has only two fit centre-backs – Titus Bramble and Matt Kilgallon.
Cuellar picked up a hamstring injury in yesterday’s FA Cup draw at Bolton and O’Shea is sidelined with a similar problem, while 33-year-old Brown has not played a competitive game for almost a year due to a knee problem, and is not expected to return any time soon.
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