It is reported that Chelsea's ownership group, BlueCo, is monitoring 18-year-old Spanish Sevilla midfielder Nico Guillén for a potential future transfer. Sevilla's sporting director, José Ignacio Navarro, has confirmed that no formal offer has arrived for the player, who recently received a new contract with an increased release clause. Guillén has had some first-team experience this season, and it is believed that Chelsea are not the only club tracking his progress.