Red Bull are reportedly ‘worried’ amid the current probe into Christian Horner as the 50-year-old fights to clear his name. Horner has been accused of ‘inappropriate behaviour’ and, on Friday, it was alleged the F1 chief had sent sexual messages to an employee. The 50-year-old strongly denies the allegations and has branded them ‘nuts’, with the Red Bull team principal also making it clear he wouldn’t be resigning from his position. Ford Motor Co. will become Red Bull’s engine supplier in 2026. And Mark Rushbrook, the global head of Ford Performance Motorsport, has claimed the F1 side are ‘wor…