Lewis Hamilton says Ferrari need "some serious talks behind closed doors" after fighting between their two drivers in Mexico.
Lewis Hamilton had to settle for third after securing his first pole position with Ferrari in Mexico
Leclerc cut a chicane on the first lap to take the lead from Hamilton, who then lost second place to Max Verstappen as a consequence of his team-mate's attack.
Verstappen went on to win the race with Hamilton second as Kimi Antonelli finished third to become the youngest world champion in Formula 1 history.
"Ultimately, that lost us the win today," said Hamilton. "We have to have some serious talks behind closed doors."
During a red-flag period in the race caused by a crash for Valtteri Bottas' Cadillac, Hamilton had said over team radio: "We've got big problems. Big, big problems."
Source: BBC Sport