The reasons behind Fernando Alonso's crash during pre-season testing in Barcelona is still yet to be determined, but McLaren maintains it has 'nothing to hide' from its end.

The two-time world champion is missing the opening round of the 2015 F1 season in Australia after crashing his McLaren at the Circuit de Catalunya. Briefly knocked unconscious and suffering a concussion, though Alonso was passed as fit by McLaren, his own doctors determined that he should not race in Melbourne.

As it stands, there remains no clear justification for Alonso's accident, but McLaren says its own investigations have ruled out any technically-induced reason for his off, even if FIA is yet to conclude its own inquest.

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"Technically, on the car, we have conducted all the investigations, very transparently and openly with the FIA and everything we have conducted so far, we couldn't find anything wrong or which has implied the accident," said racing director Eric Boullier.

"So we're still looking for further investigations but we have given our report to the FIA and we are working with the FIA so nothing else can be said but this. We have nothing to hide."

Boullier also emphasised that it is not necessary to make Alonso's personal health status public, but says McLaren's own doctor is satisfied with his condition.

"Any medical information stays within the medical field, so we have a doctor in McLaren which has access to the information but this is not public, so as far as we are concerned, the doctors are happy with all the checks, all the scans, everything which has been conducted to Fernando, so the only thing is the final decision for Fernando to be back after having respected this delay for recovery is for the doctors of the FIA."