Arsenal were successful with a £75m transfer bid for Newcastle skipper Bruno Guimaraes (Picture: Getty)Dietmar Hamann has backed Bruno Guimaraes to add a new dimension to Mikel Arteta’s Arsenal side – but claims the midfielder is still yet to prove he is ‘top class’. ‘We are delighted to welcome Bruno Guimaraes to our club,’ Arsenal sporting director Andrea Berta said of the midfielder’s arrival. ‘I think he can bring that for them, but to call him top class, I think, is a bit premature. To show he’s top class, I think he’s got to prove it now at Arsenal.’ Guimaraes has put pen to paper on a four-year contract at Arsenal, tying him to the club until 2030.