Manchester United are interested in signing Barcelona defender Javier Mascherano, [football] direct news understands. The Argentine international joined Barca in 2010 and has become a big part of the Catalan side’s recent success, occupying a centre back role rather than his usual midfield position.googletag.cmd.push(function() { googletag.display(“div-gpt-ad-1389116196215-0”); });Appearing in 30 games this season for Barcelona, Mascherano is one of Tata Martino’s first names on the team-sheet, however, reports of a summer overhaul has seen the former Liverpool man linked with an exit. Manchester United are also considering a summer of signings as they look to improve after a dismal first season under David Moyes.[FDN] understands that United admire Mascherano’s workrate and battling nature and would like to add him to their midfield options. Italian side Napoli are also said to be interested in the 29-year-old.