Fernando Alonso will need approval from Formula 1 to drive with a special helmet after fracturing his jaw in a cycling accident.
Alonso was rushed to hospital and operated on after being hit by a car near his home in Switzerland.
The operation to mend the damage was successful, but leaves the two-time world champion in a difficult situation ahead of pre-season testing.
Alonso will require a specially formatted helmet, which will need to be approved by the FIA.
He will apparently have to stop himself from clenching his teeth, as that could corrode some of the plaster inside his skull.
Testing will begin in Bahrain on March 21, one week before the season gets underway.
Alonso will be involved in testing, having confirmed via his Twitter account that he is looking forward to getting going.
He posted: "Thanks for all your wishes, I'm OK and looking forward to getting 2021 underway."
Alonso is set to end a two-year exile from the sport this season, having originally left at the end of the 2018 campaign.
The Spaniard will be racing for Alpine F1, previously known as Renault – the team Alonso won two Drivers' Championships for in 2005 and 2006.
And Alpine confirmed Alonso will be back in training shortly, but had to rest first.
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A team statement read: "Medics discovered a fracture in his upper jaw and conducted a successful corrective operation.
"The attending medical team are satisfied with his progress.
"Looking forward, after a few days of complete rest, he will be able to progressively resume training."
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