Fernandez, that finished fifth from the Moto2 season opener at Qatar three weeks past , was launched off his bike at a violent high side coming through the final corner in third party clinic at the fast-track trail.
After medics attended him trackside, the Spaniard was transferred to the gym and subsequently to hospital in the town of Santiago del Estero.
Initial xrays showed a fracture of the left ulna and radius, that will leave him struggling to competition the rest of the Termas de Rio Hondo weekend.
Surgery is planned up on Fernandez’s yield to Barcelona early weekly.
“Initially it seemed more a polytraumatic difficulty at the vertebral level, however after the x rays that we have done in the healthcare centre, [it shows] he has a double fracture of ulna and radius,”” MotoGP medical director Dr Angel Charte told Spanish broadcaster DAZN.
“We are going to lessen it here to make it well stabilised and move him to the hospital at Santiago del Estero to perform a scan.
“Our prediction is that it is a surgical break, I will speak with a healthcare facility at Barcelona so that [regular MotoGP surgeon] Dr [Xavier] Mir is aware and determine whether we are able to operate on Monday or even Tuesday.”
Fernandez faces a race against time to return to gym to its next round of the tournament in 2 week’s time at the Circuit of the Americas at Austin, Texas.
The 21-year-old is contesting his first full season in Moto2 after being called up by the Pons squad last season to replace disgraced ex-MotoGP riders Hector Barbera.