Fiat Yamaha's Jorge Lorenzo is due to leave hospital today after a succesful skin graft and further neurological tests - but the young Spaniard still cannot remember exactly what happened in the crash five days ago.

He suffered concussion in the off during last Friday's second free practice session and has scant recollection of the moments preceeding it. He has undergone CAT scans at the Dexeus Institute.

Skin has also been grafted onto on the fourth and fifth fingers of his right hand by hand expert Dr Xavier Mir, who also looked after Dani Pedrosa after his big crash earlier this year.