Lewis Hamilton takes dominant pole position for Qatar Grand Prix
By Andrew Benson
Chief F1 writer
After qualifying, Verstappen was issued with a summons by the stewards for allegedly not respecting double-waved yellow flags at the end of the final session, when Gasly was slowing with a punctured front tyre.
The hearing will be at 13:00 local time (10:00 GMT), so there will be no decision on Saturday.
If found guilty, Verstappen is likely to be handed a grid drop of in the region of three or five places.
Bottas and Ferrari's Carlos Sainz have also been summoned to see the stewards - for the slightly lesser offence of not respecting single waved yellow flags for the same incident.