Fernando Alonso says he is very disappointed not to be going racing in Melbourne this weekend and is busy training ahead of his expected return for the second round of the new Formula 1 season in Malaysia.

Alonso was involved in a heavy shunt during the pre-season testing in Barcelona and was taken by air ambulance to hospital, spending a few days under medical observation. The Spaniard briefly lost consciousness in the cockpit of the MP4-30 after the crash at the Circuit de Catalunya and under the recommendations of doctors will sit out the season opener at Albert Park.

The former Formula 1 champion has not confirmed he will definitely be racing in Malaysia to give him as much time as possible to recover.

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"Of course, I'm very disappointed not to be joining Jenson in Melbourne in the McLaren-Honda garage, but I understand the recommendations of the doctors and I'm already back in training and preparing for my first race in the MP4-30," Alonso said.

Reserve and development driver Kevin Magnussen will step in for Alonso at the Australian Grand Prix after also filling in for him at the final pre-season test. This weekend's Australian Grand Prix will be the first race Alonso has missed since joining the F1 paddock in 2001 with Minardi.

"I would like to thank everybody for their kind wishes and support and I'll be giving everything to be back in the cockpit for Malaysia," he added. "I wish Kevin all the best for this weekend in Australia, and I know the car is in his safe hands."

Despite McLaren's turbulent winter testing programme, Alonso says he was encouraged by the MP4-30. 2015 sees the return of Honda to Formula 1 but the manufacturer has struggled to find consistency and performance from the Honda RA1615H Hybrid power unit.

"Even though we faced a lot of challenges in the tests, I am very encouraged by the feeling I got from the car, and I'm looking forward to going through all of the data from this weekend with the team to continue our push for development and improve our performance."