SO it seems that Alonso was actually hurt more than they are willing to admit, he has spent more time in the hospital:
Alonso to remain in hospital for third night
24/02/2015
Fernando Alonso's manager has revealed the Spaniard is to spend a third night in hospital following his crash during testing on Sunday.
Luis Garcia Abad has told Spanish media that the McLaren driver will remain in hospital for as long as needed in order that everyone can be sure that all is OK.
"The impact was quite hard," he is quoted as saying. "We have to be sure everything is fine, so I can't say if it is one, two or three days more."
All of which appears to be in stark contrast to claims that he was "fine" and "uninjured" on Sunday.
Whilst McLaren's statement yesterday insisted that the crash was due to the strong winds at the track, particularly at that corner (T3), speculation continues, and the Spanish driver's prolonged stay in hospital is not going to help the situation.
Source
Apparently he has now been released from hospital