In 2014, Ronald Koeman replaced what former footballer from Argentina as manager of Southampton F.C.?
2014–15 Southampton F.C. season:  It was also the club's first season with Dutch manager Ronald Koeman, who replaced Mauricio Pochettino on 16 June 2014. Mauricio Pochettino: Mauricio Roberto Pochettino (] , ] ; born 2 March 1972) is an Argentine former footballer who played as a central defender, and is the current manager of Premier League club Tottenham Hotspur.
Mauricio Pochettino