( CNN ) Two-time world champion Fernando Alonso was airlifted to hospital after crashing his McLaren-Honda in the final day of pre-season testing in Barcelona Sunday . Spain 's Alonso was on his 21st lap at the Circuit de Catalunya when his car left the track at Turn 3 and hit a wall at about 150kph per hour . With the morning session immediately red-flagged , Alonso received urgent medical attention , with a screen placed around the accident scene . A statement from McLaren later gave an update on the condition of the 33-year-old Alonso . `` He was conscious and spoke with the doctors . However , as per usual procedure in such circumstances , he was then airlifted to hospital where he is undergoing precautionary checks , '' it read . Alonso 's agent Luis Garcia Abad told AFP that he would likely remain in hospital under observation for at least 24 hours . It was another setback for McLaren and its new MP4-30 car , which has been plagued by problems , with Jenson Button having to cut short his test session Saturday . Button was due to take over from Alonso for the afternoon runs , but the Briton had to sit it out . With new season set to start on March 15 in Australia , the team has only a further four-day test at the same venue later this week to sort out its problems . Alonso , who left Ferrari to join McLaren at the end of last season , has 32 career F1 wins but his two title wins date back to the 2005 and 2006 seasons . Alonso 's fellow Spaniard , rookie Carlos Sainz Junior , was fastest in the session in his Toro Rosso in a time of one minute 25.604 seconds , running on fast super-soft tires . The afternoon session gave more clues as to the readiness of teams for the season-opener with Romain Grosjean setting the fastest time of the week of one minute 24.067 second in his Lotus , again on super-softs . Last year 's all-conquering Mercedes also had good reason to be satisfied with Nico Rosberg completing over 100 laps , with his best effort the second-best of the four-day test , despite running on slower medium compound tires . Thursday will see F1 teams return to the circuit for the last official testing before Australia .
Fernando Alonso crashes in final day of testing at Circuit de Catalunya . Two - time world champion goes to hospital near Barcelona . Alonso underwent ' precautionary checks ' according to his medical team . Roman ##enko of Lotus sets fastest lap of week Sunday race .