By far the most experienced out of the three, Alaba is another defender Liverpool have been linked with.
The Austria international has transformed into one of the top centre-backs around after starting his career primarily as a left-back.
Alaba is out of contract at the end of the season and therefore can speak to clubs in January regarding a free transfer.
But Liverpool want a deal in January, with Football Insider claiming an agreement could be struck for £30m.
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