The Scottish stopper has been one of the few bright spots in what has been a terrible campaign for the Bluebirds, who are now facing a difficult last three fixtures as they look to move out of the relegation zone.
Marshall has been ever-present for both Malky Mackay and now manager Ole Gunnar Solskjaer, with his performances attracting attention from Tottenham in recent weeks.
Now Liverpool have also entered the race, with Brendan Rodgers keen to draft in a goalie to challenge current number one Simon Mignolet and provide cover for next season.
If Cardiff stay up the Northern Irishman knows that he may struggle to convince the 29-year-old to be a backup man at Anfield, but he is confident that the chance of staying in the top tier may be alluring if the South Wales side fail to beat the drop.
A fee of £6m could be enough to convince controversial owner Vincent Tan to sell the glovesman, and would barely make a dent on Rodgers’ own transfer budget – which will be boosted by added Champions League revenue.
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