Brighton and Brentford are among the clubs tracking Portugal U20 attacking midfielder Gustavo Sa.
The 19-year old started out at Porto but is now starring for Famalicao, who are currently eighth in the Portuguese top flight.
He made his breakthrough into the first team last season and has begun to establish himself as a first team starter this campaign making 22 appearances and scoring two goals.
He was part of Portugal's U19 squad that was runner-up in the European Championships last year and has been capped four times at U20 level.