By Katie Catherall 90min rounds up the latest transfer news, rumours and gossip circulating around the world… Arsenal have begun talks to sign Napolistriker Victor Osimhen and could secure the player at a reduced fee. (FourFourTwo) The Gunners will have to pay around £51m if they are to sign Ousmane Diomande from Sporting CP – with the club now willing to listen to offers for the player. (Record – Portugal) Crystal Palace are determined to keep hold of England star Marc Guehi this summer, but will demand £65m for the player if he wishes to leave the club. (The Telegraph) Tottenham Hotspur ha…