Question: When Ronald Koeman became the manager of Southampton F.C., the person he replaced went on to become the manager of what?
Sentence (from "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.
Relevant evidence: Yes