The FIA have awarded Perez a five-second penalty for the infringement on the grid, which he will serve during his pit stop.
"Have a look, because I don't think we were," Perez said via team radio.
Despite the Mexican's protestations, the FIA have no intention of overturning his penalty as he continued his fight through the field.
However, he was congratulated by the team for his start as he chased potential Red Bull replacement Liam Lawson for a place in the top ten.
Perez's performances have received consistent scrutiny this season, and has failed to step onto the podium since the Chinese GP in April, with Lawson eager to prove to the team why he deserves the opportunity.