The youngster is impressing on-loan at Rayo Vallecano this season.
The People says Reds boss Brendan Rodgers knows Saul has a fixed price of £20million in his contract with Atletico. But an offer of around £12m may work.
Liverpool can probably offer the best chance of immediate first-team football as Rodgers looks for an extra capture to keep their top-four push going.
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