Sebastian Vettel's former mentor at Red Bull – where the German won four back-to-back championships – believes he needs to change teams if he's to rediscover his championship-winning form. Dr Helmut Marko was behind Vettel's rise through junior series to his Formula 1 debut with BMW Sauber and eventual promotion to Red Bull where he dominated the sport between 2010 and 2013. However since joining Ferrari, Vettel has been unable to match that success and in recent years has become error prone, costing him points, podiums and wins, which has reportedly led to the Italian media turning its back on the 32-year-old in favour of rising star Charles Leclerc, who sits just...
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