The 20-year-old Colombia international midfielder is reportedly being monitored by a host of top European clubs, with Sebastiani revealing that the Primeira Liga champions are closing in on completing a deal. 

He told Radio Mana Sport: "Quintero appeals to many clubs, but in pole at the moment are Porto."

Asensio's Screamer Vs FC Barcelona
Asensio's Screamer Vs FC Barcelona
In one of Real Madrid's most outstanding performances at the Camp Nou, Los Blancos beat FC Barcelona 3-1 in the Spanish Supercup. Real were leading 2-1 after Cristiano Ronaldo's 80th minute goal, but just before the final whistle, we sealed the win with this beautiful Marco Asensio strike.
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Quintero has been recognised as one of the most promising prospects from South America and Sebastiani added: "The Colombian will cost no less than €10 million."