Max Verstappen and Sergio Perez are both under investigation by the stewards after Ferrari launched a protest following the Monaco Grand Prix.
Red Bull have been requested to report to the stewards due to both drivers allegedly failing to stay to the right of the yellow line at the pit exit.
Documents released by the FIA confirm that this has occurred following two protests launched by Ferrari.
It comes after Perez took the third victory of his F1 career at Monte Carlo, with Verstappen finishing in third.
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