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Mascherano, who will coach his former Barcelona team-mate Lionel Messi at the club, replaces Gerardo Martino who stood down last week due to 'personal reasons'. The 40-year-old has most recently worked as coach of the Argentine Under-20 and the Olympic team which competed in the Paris Olympics.
He made 203 appearances for Barcelona and as well as playing alongside Messi, he was a team-mate of current Inter Miami players Jordi Alba and Sergio Busquets and Luis Suarez.
"This job requires somebody with the experience to be able to maximise our unique collection of talent - from our global superstars, to our burgeoning homegrown players, to our young international prospects, and everything in between," said Inter Miami managing owner Jorge Mas.
This year, Miami dominated the MLS regular season, an achievement which led FIFA to hand them a place in next year's Club World Cup.
