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And Crystal Palace captain Marc Guehi has been put forward as one option under consideration.
The FA Cup winner has just a year left on his contract at Selhurst Park and Liverpool might be able to strike a deal for him below the asking price that was set last summer.
A year ago, Guehi was valued at as much as $93 million (£70 million) when Newcastle United submitted several bids for him.
Now, though, with the pressure on Crystal Palace to either accept less or risk losing Guehi for nothing, Liverpool might spot an opportunity.
"It's a difficult one, but if Liverpool come calling, certainly with the way Liverpool are recruiting at the minute and thickening their squad, that’s the place to go," Bent said on talkSPORT.
"I get it, you may have to go there and battle for a spot, but I think Ibrahima Konate has got one year left.
(Guehi) has got one year left, it might be best for all parties, including the player.
"Liverpool sell Konate to Real Madrid if they are willing to pay and then you buy Guehi, and then neither goes for free.
You (both) get a fee for both players, and Guehi can go to Liverpool and start.
We will see what will happen."
Liverpool.com says: Guehi would be a solid option as a third-choice center-back but losing Konate, should it come to that, would be a worry
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