 Barcelona striker Sergio Aguero has been ruled out of action for 10 weeks, deepening the Catalan's troubles ahead of the new season following Lionel Messi's short departure. Aguero, a close friend of Messi and his international teammate Argentina, joined Barcelona as a free agent in June after 10 years with Manchester City. Now, Barcelona's statement said Aguero had injured a tendon in his right calf, muscle, and would be out for 10 weeks, meaning he will not make his debut until October 17 at the earliest when they host Valencia in La Liga.