Matthew Wilson has been ruled out of Rally Sweden after breaking his left ankle in a fall while training on Saturday.
The Briton fell awkwardly during a run in England's Lake District and was taken to hospital.
"It looks as though I've broken and dislocated my left ankle so, unfortunately, that means no Rally Sweden for me," said Wilson, who had started the season with a tough run to 11th in Monte Carlo.
"I was really looking forward to Sweden. We were a lot more prepared for this rally [than Monte Carlo] and we would have been looking for a good result. I'm absolutely gutted."
M-Sport will not run a substitute driver in Wilson's absence, so his team-mate Henning Solberg will be the only driver running under the Go Fast Energy Ford banner in Sweden.