Reports from Russian now indicates that Amrabat has already been discharged from hospital but will not play a part against the Cristiano Ronaldo led side after suffering concussion in the 1-0 loss to Iran.
Amrabat was withdrawn after a 72nd minute clash of heads with Iran's Vahid Amiri in St Petersburg on Friday as the North Africans were beaten in their opening game at the tournament.
The pair were chasing a loose ball down the touchline when Amrabat sprinted into the back of Amiri, hitting his head against that of his opponent.
Amrabat spent one night in hospital before being discharged and allowed to return to the team base in Voronezh, some 500 km south of Moscow.
Despite losing the opener, coach Herve Renard is confident that the Atlas Lions can still make it from the Group stages. Against Iran, Morocco dominated proceedings but ended up pointless when substitute Bouhaddouz's last minute own goal handed Iran a famous win.
Morocco will next face European champions Portugal on Wednesday in Moscow, whilst Iran will line up against 2010 champions Spain.