Yamamoto has been going through his worst period of form in Super Formula since rejoining Nakajima Racing at the start of the 2021 season, finishing a distant 13th in the championship last year with just 13 points on board.
A second campaign with Satoru Nakajima’s eponymous team also got off to a poor start, with the 33-year-old scoring just two points in the opening four races of the year and struggling to break into Q2 in qualifying.
