It would take somewhere in the region of £3m plus add-ons linked to future appearances or transfers to prise the player away this summer.
However, if he stays until the end of his contract, Rangers could expect to get only about £500,000 in compensation.
Rangers remain hopeful, though, that Wilson will sign the contract they have offered.
The day after the defender scored his first goal for Rangers, in a 4-1 win over Hearts on 27 March, manager Walter Smith said he expected Wilson to follow the example of fellow teenager John Fleck by signing a contract extension in the following days.
However, that did not come to fruition and chief executive Martin Bain last week admitted that the two sides had yet to reach agreement and that Liverpool had made an enquiry.
Wilson has become a first-team regular at Ibrox this season and has made 24 appearances for the Scottish Premier League leaders.
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