Following his switch from Yamaha over the winter, Morbidelli was preparing for the new season on the Ducati V4 Panigale road bike when he had a crash at Turn 9, suffering a big blow to his head.
The Italian rider had to be taken to a hospital for check-ups, where doctors discovered a small clot had developed in his head.
Due to the lengthy recovery period that followed, Morbidelli was forced to miss both pre-season tests at Sepang and Losail, putting him on the back foot for this weekend's opening round in Qatar.
Speaking to the media for the first time since his Portimao fall in January, Morbidelli said he doesn't have a proper recollection of what exactly ensued in the moments before and after the crash.
"[It is] not clear. It was an out-lap and the injury is pretty strange and the crash was pretty strange," he said.
"But I don't remember, not clear images. I'm just happy that everything went like it went. Portimao is a rollercoaster. It's a particular track and can be very dangerous sometimes. But it's very fun and very dangerous, as this sport is.
"There are some upgrades on the gravel but I never touched Portimao's gravel in my life.
"I swear. Even the last time I didn't touch the gravel. Just touched the tarmac, pretty strongly with my head."
Source: Autosport