Hull City are tracking Boavista forward Renato Santos, according to reports in Portugal.
The 25-year-old is entering the final 18 months of his current contract and he is still yet to pen an extension.
That has alerted several clubs to the Portuguese player's availability, with Boavista debating cashing in on him.
Hull, according to Noticias ao Minuto, are one of those monitoring Santos and they are now weighing up a January move.
The Tigers are expected to bolster their squad during the upcoming transfer window as they bid to avoid relegation from the Premier League.