Alexis Sanchez could join several Manchester United stars sidelined during an interrupted pre-season which Jose Mourinho fears will have a lasting effect.
United hoped Sanchez would be one of few experienced forwards on their tour of the United States but the Chile star has been denied a visa after accepting a suspended sentence for tax fraud in Spain earlier this year.
His absence leaves Mourinho with just Anthony Martial and Juan Mata to choose from in attack as Romelu Lukaku, Jesse Lingard and Marcus Rashford remain on holiday after their lengthy World Cup campaigns.
David de Gea, Nemanja Matic and new signing Fred are expected to link up with the squad next week, prior to the first of three International Champions Cup clashes.