Earlier this year, Zoran Stefanovic revealed plans for a second attempt to enter a team for 2019, having previously tried to enter as Stefan GP.

There are believed to several parties, including a group from China, that are evaluating entering F1.

But though Todt has had contact from interested candidates, he has seen nothing serious enough to warrant the FIA opening a tender for an additional slot on the grid.

"Not something I will comment as a very serious offer," said Todt when asked if he had had any reasonable offers.

"When we will see there is some serious offer, as we did, when Haas came to Formula 1, we understood there was some serious interest so we created a tender."

Previously, F1 had a maximum 26-car grid capacity and has not featured that many cars in its field since the middle of the 1995 season.

Todt said the current agreement is to have a grid of 24 cars but commented "never say never" regarding the possibility of welcoming a 13th team if the situation presents itself.

"At the moment, we have 10 teams competing in F1," said Todt, who was speaking at an FIA Action for Road Safety press conference at Monza.

"We have a good championship. The maximum number of teams we would accept is 12 so I'm happy to listen to any good proposals.

"We are working to have an even better championship, but the agreements we have is for a maximum for 12 teams."

Given there are only five-and-a-half months left until pre-season testing for the 2018 season begins, should a new team be given the go-ahead, it be looking at an entry for 2019 at the earliest.