Fernando Alonso suffered a concussion in a crash during Formula One pre-season testing in Spain.

The driver was airlifted to hospital after his McLaren went off the track and collided with a wall at the Barcelona-Catalunya circuit.

"Fernando's accident was just one of those things that happens in testing," said team director Eric Boullier. "Fortunately, he's fine, but was concussed during the accident, which therefore required an overnight stay in hospital as a precaution. That's normal practice after a concussion."

The Spaniard crashed after completing 20 laps. The accident occurred at turn three, when he car went off course and the right-hand side of his car hit the wall.

Neither the team nor track officials have reported the cause of the crash. Boullier said the car was not badly damaged.

Alonso, 33, rejoined McLaren this season after a disappointing fifth and final campaign with Ferrari. He won back-to-back world titles with Renault in 2005 and 2006 before spending one season at McLaren in 2007.

He has 32 career grand prix victories, the last of them at Montmelo in 2013.

Testing resumed at the track after a slight delay following the lunch break.