O Jogo says Liverpool are keen on Vitinha and assistant manager Pepijn Lijnders is keeping a close eye on the 22-year-old.
Vitinha's performances this season have caught the eye of Europe's top clubs, with the Reds said to be among the ones looking to make a move in the summer.
The youngster has made 38 appearances in all competitions this season and has three goals to his name.
Bayern Munich and Lazio are also keen on the player but the report goes on to say that Porto will accept no less than his €40m release clause.
Vitinha had time on-loan with Wolves last season.
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