The 35-year-old released a statement on social media earlier this week providing an update on his health.
“Hi everyone, hope you’re all well,” he said.
“I know I haven’t been in touch this past week, It’s definitely been one of the hardest weeks that I’ve had for some time.
“I’ve just been focusing on recovering and trying to get back in shape so I can get back in the car and race the final race in Abu Dhabi.