Striker Odion Ighalo is being kept away from his new Manchester United teammates after arriving in the UK from China.
The club have chosen to take the "precautionary measure" to combat any potential risk of coronavirus infection.
Ighalo, 30, also missed out on United's recent winter training camp in Spain, with concerns surrounding whether he would be permitted back into Manchester.
The striker is expected to link up with the squad for the first time on Monday, as United head south to Stamford Bridge for their Premier League fixture with Chelsea.
Ighalo is currently partaking in a personalised programme alone to ensure peak fitness ahead of his debut.
Close scrutiny is being paid towards all travellers arriving from China, as the virus - which has now infected 60,000 - continues to spread throughout the world.
Medical experts are recommending that anyone coming in from the East Asia nation quarantines themselves for two weeks.
Ighalo has played football in China for the past three years, moving to Old Trafford from Shanghai Greenland Shenhua in the January transfer window on a loan deal.