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The Renault Formula 1 team has protested the Haas of Romain Grosjean following the Italian Grand Prix.
Grosjean finished sixth at Monza, which elevated Haas above Renault into fourth in the constructors’ championship.
Renault scored two points for Carlos Sainz Jr’s ninth-place finish, but slipped behind its American rival having been comfortably clear a few races ago.
The FIA has summoned a team representative from both teams because of a “protest by Renault Sport Formula One Team against car 8 [Grosjean]”.
A Renault statement read: “We confirm that Renault Sport Formula One Team has submitted a request to the Stewards of the Event for clarification on the legality of the Haas F1 Team VF-18.
“We have no further comment on this matter until the Stewards have arrived at a decision.”
No information has been released on the nature of the protest, though the FIA has indicated it relates to a small detail on the leading edge of the car’s floor.
Haas team principal Gunther Steiner said his outfit had been taken by surprise on hearing news of the protest.
“It’s fine, we’ll go and listen to it and then we see what we do,” he said.
“I don’t know what they want. It has been taken by surprise.”
Haas came under fire earlier this season for its links to Ferrari and the design of its 2018 challenger, with McLaren and Force India suggesting the FIA should investigate. However, no formal concern was ever lodged.