Porto are drawing up plans to sign permanently on-loan Watford winger Miguel Layun.
The Mexico international moved to Porto on a season-long deal from the Hornets in August.
Layun has been impressive for the Lisbon giants and Porto are eager to deal him in.
Watford and Porto had agreed a €6 million fee for Layun to sign permanently in June.
Porto are eager to close an agreement, but want to drive down the asking price.