Russell Martin knows he needs to change something at Southampton having seen his side lose their first three games of the Premier League season. Southampton earned promotion playing a very possession-focused style in the Championship as Russell Martin imprinted his philosophy following his appointment last summer. The Saints manager is keen to stick to his principles in the Premier League but this has been unsuccessful so far as glaring errors against Newcastle United and Brentford were punished. The international break has come at a good time for Southampton, with Martin given the opportunity…