Guintoli, who recently signed a contract to remain with the team, was offered the alternative to move to the World series after Suzuki factory bosses and the Alstare team witnessed his impressive migration to the Superbike class in the UK during the 2009 season.
Said Suzuki GB Managing Director, Yasuharu Osawa: "Sylvain has proven to be an incredible asset for Suzuki this year, despite his unfortunate injury early on. We want to support Sylvain's career while also doing what is best for the Suzuki family, so following Alstare's request, we have unanimously agreed for him to move to World Superbikes for the 2010 season. We would like to thank the BSB team sponsors, especially Worx, for their complete support in this decision."
Worx Crescent Suzuki team manager, Jack Valentine added: "To have Yukio back in the UK is great news. He is still a class act and was incredibly popular with UK fans during his two-year stint in the series last time. He is as determined as ever and will be back here with one goal in mind - to challenge for the title. Our decision to run two riders in 2010 is also good news for the BSB Championship, for Suzuki and for all of our partners."
While the Worx Crescent Suzuki team have confirmed their two rider 2010 championship assault, confirmation of the full rider line-up will be confirmed at a later date.