The Swiss watchmaker has not renewed a deal that gave it title sponsorship of the Blancpain GT Series Endurance Cup in Europe, as well as SRO's GT World Challenge sprint series around the world.

The partnership with SRO stretches back to 2009 when it was a sponsor and timing partner in the FIA GT1 World Championship, pre-dating the launch of the Blancpain Endurance Series in 2011.

Ratel said: "It was a fantastic 10 years, an exceptional partnership because they were much more than a sponsor.

"Everyone in the world of motorsport now knows what Blancpain is: it worked for them to promote their brand and it worked for GT racing."

Ratel explained that he would now be focussing on the GT World Challenge brand, which he adopted for SRO's sprint-format series in Europe, North American and Asia for 2019.

The BGTS will next year become the GT World Challenge Endurance Cup.

"With the GT World Challenge we have a very good title across our championships," he said.

"One of our weaknesses has been that we have had too many name changes, but GT World Challenge is now our definitive name, our brand like MotoGP.

Ratel didn't rule out a sponsorship deal for the series.

"It could become the World Challenge powered by someone, and that is something we are having a lot of conversations about," he said.

Points are scored in the three GT World Challenge series towards an overall manufacturers' title.

Mercedes won the inaugural crown in 2019 from Ferrari, the only other make to register.