Fernando Alonso has spent a third night in hospital following his accident during F1 testing at the Circuit de Catalunya.

The Spaniard, who was airlifted to hospital following the accident on Sunday, was diagnosed with a concussion on the day after receiving CT and MRI scans, while McLaren insisted he was otherwise uninjured.

Despite this, Alonso remained in hospital on Tuesday night and is still unknown when he will be discharged. His manager Luis Garcia Abad is quoted as saying it could take 'one, two or three days' more before he is released from hospital.

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Though McLaren was emphatic in its claim Alonso's crash was caused by a gust of wind pushing him off-line and pitching him into a spin, the two-time champion's continued stay in hospital does little to dampen speculation that there is more to the stated injuries than meets the eye.

Beyond Monday's statement about Alonso's condition and its preliminary investigation into the crash's cause, McLaren is yet to provide a further update but is expected to do so today.

Though it said it would evaluate putting Alonso in the car for the second F1 test, this appears increasingly unlikely now. As such, McLaren could take the opportunity to give Jenson Button a full four days in the car to make up for lost mileage in the McLaren-Honda MP4-30, or it could call upon test/reserve drivers Kevin Magnussen and Stoffel Vandoorne.