Sauber driver Sergio Perez has been cleared to race in the Canadian Grand Prix after passing a medical.
The 21-year-old spent two nights in hospital after being knocked unconscious in a heavy crash during qualifying for the Monaco Grand Prix.
But an examination by the FIA on Thursday gave the Mexican rookie the all-clear to resume racing.
"It was a very good examination as they checked all my bones, my memory, my reaction," Perez said.
Perez, who revealed that his own doctor's observations were taken into consideration, added: "After the accident I felt dizzy, which is why I stayed another day in hospital, but we were always positive there would be enough time to recover ahead of this race.
"There was nothing damaged, no problems at all, so it was only a matter of time to return to normal life."
That "normal life" included a stint back behind the wheel in karting.
"I flew to Mexico and had some days at home which was very important, which included some karting, and everything was OK," added Perez.
"It's always important when you've had a big crash to go out and drive something."
Perez suffered concussion and a bruised thigh during qualifying at Monaco when he crashed exiting the tunnel and plunged his Sauber into the barrier at the chicane.
The session was stopped for half an hour while crews extricated him from the car before taking him to the Princess Grace hospital in Monte Carlo.
Perez did not take part in the race as he was kept in hospital for two days for observation.
McLaren driver Jenson Button had described the chicane where Perez crashed as one of Monaco's "danger spots". The Englishman crashed there himself in 2003.
Perez's accident was the third over the race weekend. Renault's Vitaly Petrov also crashed there on Thursday and Mercedes driver Nico Rosberg suffered a similar incident at the same place in final practice.
Perez, who is also part of the Ferrari driver academy, secured his first points in Spain, where he finished ninth.