Barcelona could look to sign unsettled Manchester City defender and captain Vincent Kompany this summer, [football] direct news understands.The 28-year-old could be a surprise contender for the exit door at the Etihad Stadium this summer after some below-par recent displays, which have led manager Manuel Pellegrini to consider axing him for next season as he targets new signings for his defence.The Chilean tactician missed out on a number of high-profile targets last summer, such as Real Madrid’s Pele and Porto youngster Eliaquim Mangala, and looks likely to try again for some new blood to replace the under-performing Kompany.Barcelona have some well-documented defensive problems of their own, and the Belgian centre-back has emerged as a target of theirs in the past, so his potential availability this summer looks to have put the Catalan giants on alert.A whole host of big names have been linked with moves to the Nou Camp in recent months, with Chelsea’s David Luiz also believed to be high on their list of priorities, but Kompany could also be a good option to come in and replace the departing Carles Puyol.It is likely that Barca will bring in at least two defensive players, a European football insider revealed. “Kompany does not look at his best in Manchester and would surely be one of their main targets if he is available.”Juventus and Monaco have also been mentioned as possible suitors for Kompany this summer.