Sergio Perez, George Russell and their respective Red Bull and Mercedes teams were called up to the stewards after qualifying at the Austrian Grand Prix.
Perez and Red Bull were summoned first over an alleged breach of Article 33.3 of the Sporting Regulations due to "leaving the track without a justifiable reason".
Along with a team representative, Perez headed to see the stewards at 19:00 local time (18:00 BST) for a discussion over the matter.
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Meanwhile, Russell has been summoned regarding an alleged breach of Article 12.2.1 h) of the International Sporting Code and/or Article 26.7 b) of the Sporting regulations for "entering the track on foot".
It came after Russell crashed out in the closing minutes of the Q3 phase, with the Briton jumping from his car - which was stuck in the Turn 10 barriers - and jogging straight back to the pit lane under red flags.
Russell and a team representative were called in at 18:45 local time (17:45 BST), with decisions on both incidents to follow.
Perez and Russell qualified fourth and fifth respectively.
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