Fernando Alonso has left hospital following his three night stay in the wake of his accident during pre-season testing at the Circuit de Catalunya.

The Spaniard was airlifted to hospital and sedated after crashing on the exit of turn three and striking the inside wall in his McLaren-Honda MP4-30.

Diagnosed with a concussion on the day, McLaren said on Monday that he would remain in hospital to allow the effects of sedation to wear off, though the length of his time in hospital has raised speculation over whether his injuries were of more concern.

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Nonetheless, a short statement from McLaren has confirmed Alonso will return home and won't participate in the upcoming final test of the pre-season at the same circuit, with Kevin Magnussen drafted in to join Jenson Button.

"Following his testing accident at the Circuit de Barcelona-Catalunya last Sunday, we are pleased to confirm that Fernando Alonso has now left hospital. He has returned to his family's home in Spain for further rest and recuperation."

McLaren has emphatically denied claims Alonso may have been electrocuted by the ERS or his car suffered a mechanical failure prior to his accident, the team claiming a gust of wind pushed him off-line and pitched him into a spin.