Superstar striker Erling Haaland has reportedly informed Borussia Dortmund he will leave the Bundesliga club at the end of the season to join Premier League champions Manchester City. Sky television and The Athletic portal have reported City boss Ferran Soriano has informed Dortmund chief executive Hans-Joachim Watzke that they will activate a 75-million-euro (78.9-million-dollar) release clause in Haaland’s contract. According to the Belgian newspaper Nieuwsblad, Haaland also completed medical tests at the Erasmus hospital in Brussels on Monday. Dortmund said the player was allowed to have th…