Petit was appointed manager of C.S. Marítimo on 27 November 2018, on a contract lasting until the end of the campaign. He left the Madeiran club at its conclusion, as it did not exercise the option of another year. On 15 January 2020, Petit was hired by his sixth Portuguese top-division club, becoming the third coach of Belenenses SAD's campaign as the team was one point above the relegation zone. Boavista  Benfica  Portugal