The interest in Villarreal winger Samu Castillejo is intensifying.

Samu has enjoyed an outstanding campaign with Villarreal this season, with his form attracting the interest of clubs from across Europe.

Scouts from Atletico Madrid, Arsenal, Tottenham, Manchester United and Manchester City have been regulars at Villarreal games since the New Year checking on the midfielder's progress.

Villarreal management are well aware of the growing interest and will seek to sell for around €20 million.

Samu, 22, is a Spain U21 international and came through the system at Malaga.