Fernando Alonso's manager says he could face 'one, two or three days more' in hospital as doctors continue to assess him following his crash in pre-season testing at the Circuit de Catalunya.

Alonso was airlifted to hospital after crashing at turn three on the final day of F1 testing in Spain, with McLaren going on to blame 'unpredictable gusty winds' for the spin that pitched him into the inside wall.

Sedated at the time, Alonso was later diagnosed with a concussion and though he went on to spend a second night in hospital, McLaren insists he is otherwise uninjured.

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Even so, Alonso's manager Luis Garcia Abad has emphasised the 'serious impact' against the wall, adding that doctors are being cautious for the time being and suggesting it could prolong his stay in hospital

"He will remain here the time that we need to be sure that everything is fine," he said. "The impact was quite hard and we want to be sure that everything is fine. I can't say is it is one, two or three days more.

When pushed on whether Alonso has given more information about the accident - in particular whether Alonso lost consciousness at any time -, Abad went on to say that 'F1 is not a game' and that he wants to be certain his driver is back in peak condition before he returns to the car.

"The information is quite difficult to understand. When I arrived at the hospital, Fernando was conscious and fine in this aspect, which is the most important thing, but now is fine. The crash was very hard and he has to recover because it was a serious impact.

"F1 is not a game, we have to be sure that he is ready to drive the car at the right time because we want to be competitive to the last race of the season."

McLaren is yet to decide whether to replace Alonso for the final test, which gets underway on 26th February. Jenson Button could potentially get forur days in the car - particularly as his test mileage has been hampered by technical issues -, though McLaren could also potentially call up Kevin Magnussen and Stoffel Vandoorne.