By Katie Catherall Pep Guardiola believes that Manchester City will not be ‘dragged down’ when he decides to leave the club, unlike the recent history at Manchester United. The Catalan boss will be out of contract in the summer after an immense eight-year spell at the Etihad Stadium, lifting six Premier League crowns and becoming the first club in English football history to secure four back-to-back top-flight titles. Guardiola’s potential departure, along with the confirmed summer exit of sporting director Txiki Begiristain, has been a cause for concern for City fans. However, City’s trophy-l…