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Romain Grosjean's Haas has been disqualified from the Italian Grand Prix after his Formula 1 car was found not to be in compliance with the regulations.

Following a protest lodged by Renault against Grosjean's Haas immediately after F1's race at Monza, the stewards asked the FIA's F1 technical delegate to investigate the case.

A statement issued by the stewards said that the floor of the car was found to be in breach of the rules.

"The reference plane of car number 08 is found not to be in compliance with Article 3.7.1 d) and the clarifications given in TD/033-18 published on 25 July 2018," said the FIA.

The article mentioned states: "The surface formed by all parts lying on the reference plane must have a 50mm radius (+/-2mm) on each front corner when viewed from directly beneath the car, this being applied after the surface has been defined."

The failure of the Haas to comply with the regulations means it is disqualified from the results - and means Haas will move back behind Renault to fifth place in the constructors' championship.