Morabito was driven from Fremantle Oval by coach Ross Lyon in dramatic scenes after he injured the knee when tackling new recruit Tanner Smith in a training drill.
The 21-year-old went for scans and the Dockers expect to know the results by 2pm.
Club medical staff who viewed footage of the incident were unsure whether Morabito had re-torn his anterior cruciate ligament.
Morabito grabbed at his left knee before slumping to the ground on