After collapsing on Tuesday, Musiala shared a statement on Instagram saying seizures have become a regular part of his daily life.
Absence seizures are a type of generalised seizure most commonly seen in children and young adults.
They are classified as either typical or atypical.
Dr Meneka Sidhu, a consultant neurologist at the National Hospital for Neurology and Neurosurgery in London, said typical absence seizures usually last only a few seconds, during which a person may seem to be daydreaming or staring blankly.
During an absence seizure, awareness is reduced to varying degrees; the person may become unresponsive and can lose balance.
Dr Sidhu noted that these episodes can be very brief, allowing someone to resume activities as if nothing happened. Atypical absences last longer and can involve automatic movements such as hand fidgeting, eyelid fluttering, or lip smacking, and some individuals may fall.
Recurrent absence episodes over more than 24 hours can indicate epilepsy, though medication can effectively treat them.
She added that identifying triggers is important for anyone with epilepsy; for athletes, potential triggers include hyperventilation and dehydration.
With effective treatment, absence seizures should not prevent participation in sport.
Musiala’s condition has also been managed by other elite athletes.
Rugby player Tommy Freeman began experiencing absence seizures at 14 and, after being diagnosed with epilepsy, now manages the condition with medication while playing for Northampton and England.