Arsene Wenger was Arsenal 's manager up to 2018 .
During this period , there was enmity between the two longest serving managers in Premier League history , Arsenal 's Arsène Wenger ( 1996–2018 ) and United 's Sir Alex Ferguson ( 1986–2013 ) , and their former club captains Patrick Vieira and Roy Keane .
Arsenal F.C.–Manchester United F.C. rivalry