The 23-year-old is currently on loan at title chasing French club Nice.
But according to the Daily Star, scouts from Liverpool have watched Pereira on several occasions this season.
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Liverpool fans are not happy with the club's owners FSG
The Portuguese international is comfortable in either full-back position.
Liverpool boss Jurgen Klopp lost confidence in Alberto Moreno which has led him to play James Milner at left-back.
However, Klopp wants to sign a permanent recognised defender in that position.
Ricardo Pereira has been scouted by Liverpool
The report says Pereira is valued at around £22million and Porto are open to selling him.
It is claimed Inter Milan are also interested in Pereira and are likely to submit their own offer for the player.
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But Liverpool are understood to have made clear to Pereira’s representatives that they considering a move.