The loss was Chelsea’s heaviest since 1991 when they were defeated 7-0 by Brian Clough’s Nottingham Forest Chelsea captain Cesar Azpilicueta apologised to the club’s fans after Manchester City’s 6-0 win at the Etihad Stadium on Sunday. City’s demolition of the Blues was their heaviest defeat in 28 years  and made it four away losses in a row in all competitions for Maurizio Sarri’s side. Sergio Aguero hit a hat-trick, Raheem Sterling scored twice and Ilkay Gundogan was also on…