Record says Liverpool boss Jurgen Klopp is interested in a move for Diaz after watching him in the Champions League.
Diaz, who is usually deployed on the left flank, played 90 minutes in both of Porto's games against Liverpool, and, although the 24-year-old ended up on the losing side on both occasions, he still showed glimpses of his ability.
A Colombia international, Diaz joined Porto from Junior in his homeland in 2019.
So far Diaz has made 115 appearances for Porto, during which he has scored 36 goals and has provided 15 assists.
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