Mauricio Pochettino has agreed to become Manchester United's head coach from November 18, the club said on Friday. The 54-year-old has left his role as United States head coach to take charge at Old Trafford on a two-and-a-half-year contract. Pochettino replaces Michael Carrick, who was sacked on Thursday after 15 games in charge, having signed a two-year contract in May.