Fernando Alonso has "zero worries" about stepping back into his McLaren this weekend, despite adding further confusion to the testing accident that forced him to miss the season-opening Australian Grand Prix.

Alonso has been declared fit for Sunday's race in Malaysia following an examination undertaken at the Sepang International Circuit by the FIA medical delegate and chief medical officer.

But it was his virtually solo performance in the FIA press conference - Nico Rosberg, Kimi Raikkonen, Carlos Sainz Jr, Daniil Kvyat and Felipe Nasr were also present, but virtually non-existent given the focus on the Spaniard - that raised eyebrows.

First, Alonso blew apart McLaren's claim a gust of wind was the cause behind his crash in the second pre-season test at Barcelona's Circuit de Catalunya on February 22, insisting the steering locked.

Then Alonso stated his recollection of the accident was clear, and that any concussion sustained was seemingly medically induced to assist with his transfer via helicopter to hospital, and the medical tests that followed.

"I remember the accident, and everything the following day," Alonso said.

"There is nothing in the data, anything clear we can spot and we can say it was that, but definitely there was a steering problem in the middle of turn three. It locked to the right.

"I approached the wall, braked at the last moment, downshifted from fifth to third. Unfortunately, on the data, we are still missing some parts.

"It's clear there was a problem in the car, but it just hasn't been found on the data at the moment."

As to McLaren's 'gust of wind' claim, Alonso stated: "No, no, definitely not.

"I don't know if you've seen the video, but even a hurricane would not move the car at that speed.

"Also, if you have a problem or a medical issue (inside the car), normally you would lose power and would go straight to the outside - never to the inside (as he did).

"In a Formula One car you still need to apply some effort on the steering wheel."

Offering potential excuses for McLaren, given the clamour for news as to his accident and condition, he added: "With the repercussions, the news, being in Spain, there was a lot of attention that day.

"Probably the first answers, or the first press conference the team gave, my manager, whatever, all the stuff around in those early days, it was just some guess - the wind, maybe other possibilities.

"That creates a little bit of confusion, obviously, but you cannot say anything for three or four days until I remember everything.

"That makes those three or four days even worse, so I think they said the theory of the wind, etc, but obviously it was not a help."

As to the debate regarding his unconsciousness, which was why he then spent three days in hospital and was ruled out of the race Down Under for fears of 'second-impact syndrome', Alonso again muddied the waters.

"I was perfectly conscious at the time (of the accident)," he added.

"I lost consciousness in the ambulance or the clinic at the circuit.

"But the doctors said this was normal because of the medication they gave me for the helicopter transportation and the checks they did in the hospital.

"The MRI and evaluation needs this protocol, needs this medication, so it is normal that maybe you don't remember."

Despite claiming there to be an undiagnosed issue with the McLaren, the two-time former world champion maintains he has every faith in the car and team.

"I fully trust the team," the 33-year-old said.

"They've been looking at every single component of the car for a month, simulating the efforts, doing so many tests.

"They've been changing every single part they had some doubts about, so I think we have the safest car right now because of all the studies they've done.

"And after one month, I'm probably the most medically checked driver in history so we should be fine - both of us (including team-mate Jenson Button).

"There is zero problem, zero worries on my side. Everything is okay."

Button, who completed the race in Australia, albeit two laps down on race winner Lewis Hamilton and finishing 11th and last, like Alonso has no fears over the car.

"I've looked at the data and I'm happy to drive the car. My view hasn't changed on that," the Briton said.

"After seeing the data and watching the steering trace, my view hasn't changed from when I saw the data initially.

"I feel comfortable getting into the car and driving it."