Martin Keown has now been discussing one Arsenal departure in the past under Arsene Wenger that left him feeling quite frustrated. Keown, who played for Arsenal on 440 occasions, certainly knew what it took to win during his time in North London. The centre-back won the league title on three occasions and also helped deliver four FA Cup titles in what proved to be a decorated era for the club. And Keown certainly wasn’t the only Arsenal player left extremely disappointed when Nicolas Anelka decided to leave back in 1999. Despite wanting him to stay at Arsenal, Wenger ended up selling Anelka to…