Summary:
Barcelona are reportedly interested in signing Atletico Madrid midfielder Koke, while the Spanish champions are also interested in defenders Marquinhos and Jeremy Mathieu.

Full article:
Barcelona are chasing as many as six new faces this summer in an attempt to claw back the La Liga title. Reports in Spain claim that new manager Luis Enrique is keeping tabs on Atletico Madrid's Koke and Marquinhos from Paris Saint-Germain. The pair are two of the hottest properties in Europe at the moment, and Barca are on the hunt for quality as they look to re-mould their squad. Wanted man: Barcelona are chasing Atletico Madrid midfielder Koke as they plan to make big signings . Looking: Both PSG defender Marquinhos (left) and Valencia's Jeremy Mathieu are interesting the Catalans . On his way? Manchester City have fielded a £31m bid for Argentine Sergio Aguero, according to his dad . Gerardo Martino's solitary season in charge ended without silverware, and Mundo Deportivo say Valencia's Jeremy Mathieu and Real Sociedad goalkeeper Claudio Bravo are on the radar. Sergio Aguero's dad said on Saturday that the Catalans had made a £31million for the Manchester City striker, while Fiorentina's Juan Cuadrado has also been linked. Cuadrado is a nippy wide man and has been reported to have interested Brendan Rodgers and Liverpool already this summer. Skippy: Fiorentina's Colombian winger Juan Cuadrado is attracting interest from across Europe .