Arsenal have reportedly seen their first formal bid for Newcastle United midfielder Bruno Guimaraes rejected, with the Premier League club turning down the opening proposal as negotiations begin. Newcastle have rejected the initial bid, but the development appears to mark the beginning of discussions between the two clubs over a potential transfer for the Brazilian midfielder. Negotiations begin after opening offerThe transfer speculation surrounding Guimaraes has been gathering momentum over the past few weeks. Reports have suggested that the midfielder has already encouraged Newcastle United to enter into discussions with Arsenal regarding a possible move. Pundit Alex Crook has confirmed that Arsenal have made a formal offer for Guimaraes.