Gabriel Bortoleto and Nico Hulkenberg are both under investigation following infringements during the final practice session for the United States Grand Prix at the Circuit of the Americas.
Hulkenberg will be up first to face the stewards following an alleged breach of a practice start incident, timed at 12.41 local time, 11 minutes into the session.
Bortoleto will then follow his team-mate shortly after following what appeared to be a clear impeding of Ferrari's Lewis Hamilton into the sharp left-hander at Turn 12.
Hamilton, who eventually topped an FP3 timesheet for the first time in two years, was on a fast lap but had to brake hard into the corner as Bortoleto was travelling slowly and on the racing line.
Bortoleto already faces an 80-place grid penalty for a double power unit change this weekend.
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