By 90min Staff 90min rounds up the latest transfer news, rumours and gossip circulating around the world… Liverpool, Manchester City, Barcelona and Real Madrid are all heavily interested in signing Florian Wirtz from Bayer Leverkusen this summer. (Fichajes – Spain) However, suitors for Wirtz have been informed he is set to stay at Leverkusen this summer. (TBR Football) Newcastle striker Alexander Isak has emerged as the top striker target for Arsenal this summer, with Mikel Arteta keen to sign a new forward to ‘complete his team’. (Independent) Another striker who could be on the move is Rob…