SGP is a public institution established to fund and oversee the development of the Grand Paris Express, a subway transport system which has been described as the largest infrastructure project in Europe.

The subway will serve the Grand Paris region, including sites which will be used at the 2024 Olympic and Paralympic Games if the French bid is successful.

Featuring 200 kilometres of railway track, the project will create four new metro lines and extend two existing ones in Paris.

The network will serve 68 stations and will be "a catalyst for the construction and development of new housing across the region", it is claimed.

Paris 2024 will "utilise SGP’s expertise in transportation planning and development to help shape the Paris 2024 bid and optimise the visitor experience during the Games," a statement from the bid said.

"Most of the project will be completed before the proposed date of the Paris 2024 Olympic and Paralympic Games - guaranteeing locals and visitors exceptional transport conditions throughout the city during the Games," the statement added.

As an official supplier, SGP will open Fabrique du Métro - an innovation centre that will showcase and explain the Grand Paris Express.

This will be based in Saint-Ouen, near to the proposed Olympic and Paralympic Village.

A digital 3D model of venues and sites included in the Paris 2024 bid plan will also be created.

Bernard Lapasset, the co-chairman of Paris 2024, said: "We are very pleased to welcome the Société du Grand Paris as an official supplier of Paris 2024. 

"The expertise of SGP in transportation planning and development will help to shape our thinking towards spectator experience and strengthen the social mobility legacy of our project - ensuring Parisians benefit from the new infrastructure long after the Games have ended.

"We have built a very strong network of official partners and suppliers and we thank them all for the contributions they have made, both financially and in terms of the invaluable expertise and insight they have provided. 

"By working together with all of our stakeholders we believe we can deliver a wonderful festival of sport and Olympism in 2024 that unites the nation and brings real benefits to the people of Paris and France."

Transport is often a headache for Olympic organisers - including last month in Rio de Janeiro when a key subway line only opened four days before the Opening Ceremony.

Paris, which is bidding against Budapest, Los Angeles and Rome for the 2024 hosting rights, had already announced 12 bid partners.

A host city will be elected at the International Olympic Committee Session in Peruvian capital Lima in September next year.

Philippe Yvin, chief executive of the SGP, said: "The Grand Paris Express and Paris 2024 have a shared unifying vision to improve social mobility and add economic value across Paris and France. 

"The Paris 2024 bid for the Olympic and Paralympic Games is a fantastic opportunity to engage all of society enabling the whole region to pool their energy towards a project that will have long term benefits for everybody. 

"We are honoured to be part of this collective effort."