The 19-year-old came close to joining the Reds at the age of 16 and 18.
Doku blossomed at Anderlecht before earning a move to Rennes two years ago.
According to Calciomercato, Liverpool are now evaluating Doku for a summer transfer.
Blessed with incredible pace and agility, Doku shone for Belgium in their unsuccessful Euro2020 campaign.
Injuries have disrupted Doku this season, but that hasn't stopped Liverpool from trying to sign the youngster.
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