Pascal Wehrlein has revealed the extent of his back injury in a social media post thanking Sauber for the team's hard work in helping him return to fitness.
Having missed the opening two rounds due to a lack of fitness after fracturing three vertebrae in his back in a crash at the Race of Champions in January, the German-Mauritian impressed as he finished 11th on his Formula One race debut for Sauber at the Bahrain Grand Prix.
On Monday Wehrlein posted images on Twitter showing him in a neck brace during the early stages of his rehabilitation from the injury.