hans-wilhelm muller-wohlfahrt has served the club for almost 40 years .
muller-wohlfahrt claims the german champions ' medical department has been blamed for wednesday night 's 3-1 first-leg defeat in portugal which left their champions league hopes hanging by a thread .
the 72-year-old medical professional , renowned as a world leader in his field , said ` the bond of trust is damaged ' and called centred at his department ` inexplicable ' that his son kilian , an amino acid preparation derived from calves ' blood .