The 60-year-old is expected to first go into self-isolation for seven days after coming into the country from Brazil.
The Argentine, who has spent the last year in Brazil coaching Atletico Mineiro, was appointed by Marseille last Friday.
The ex-Chile, Argentina and Sevilla boss, who has signed a contract until 2023, is the permanent successor to Andre Villas-Boas in charge of the former Champions League winners.
Villas-Boas was suspended by the club a month ago following a disagreement over transfers. On Tuesday Marseille confirmed that they had finally officially parted company with the Portuguese "by mutual agreement".
Since Villas-Boas was removed from the dugout, interim coach Nasser Larguet has overseen the team's last seven games, losing just once, to Paris Saint-Germain.