Now, his father Mane Diaz has hinted that the Reds star could consider moving to La Liga in the future. Real Madrid have also been linked with Diaz in the past, and may be tempted to reignite their interest after his father's comments.
WHAT MANE DIAZ SAID
Speaking to Cadena SER, Mane Diaz said: "When he left Porto I was not aware that there was anything positive with Madrid clubs. I heard things, but I never knew if there was anything else. With Liverpool everything was more precise.
"The directive was more precise for Luis to arrive there. It was hoped that he could come here [to Spain]. Radamel Falaco had already been there, James Rodriguez too... In the end it didn't happen, but don't give up hope yet. He is playing and the clubs are active."
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The 27-year-old is all set to return to Anfield after starring for Colombia during the international break and will be next seen in action for Jurgen Klopp's side on Sunday, as they take on Brighton in a vital Premier League clash.