It has been a relatively quiet start to the transfer window for Arsenal.Despite the lack of substantial business so far, Andrea Berta's tactic of casting the net wide before narrowing down his top targets means that speculation has not been in short supply.Bruno Guimaraes is the latest to be linked with a move to north London this summer.Bruno Guimaraes is impressing for Brazil at the World CupGettyArsenal have enquired about his availability and initial talks with the player's representatives have been held.While Newcastle have insisted the midfielder is not available, it has been claimed that the Gunners proposed at least one offer worth around £55million during positive talks with Arsenal are looking to sign a midfielder this summer and Mikel Arteta places a high value on signing player