Explained: The Swedish striker is determined to leave St James’ Park and Fifa’s amendments to article 17 give him an exit route next summer that would potentially cost Newcastle millions of pounds

Alexander Isak cannot terminate his contract at Newcastle to force a transfer to Liverpool this summer using a FIFA rule revised after Lassana Diarra’s court case. Article 17 of FIFA’s Regulations on the Transfer and Status of Players was rewritten following a court case last year which ruled their previous wording breached EU law.