The former Al-Ahli head coach, chosen by the club’s Saudi owners to replace Eddie Howe, admits ‘vacuum’ after sale of three key players Matthias Jaissle has been described as “fire” and a “rockstar”, but his formal “unveiling” as Newcastle’s manager revealed a rather more considered and conservative character than advertised. At the precise moment the clock struck 3pm on Tuesday the 38-year-old German walked into a packed media suite at St James’ Park. Before taking his seat on the stage Jaissl…