The Red Devils have their first game after the winter break away to their top four rivals on Monday.
But Ighalo, who arrived from Shanghai Shenhua on loan on deadline day, is not likely to start.
The Evening Standard suggests that Ighalo will have little time to impress the manager given he did not travel to their training camp in Spain.
The player is 100 percent fit, but United were concerned about his possible re-entry to England, as he arrived from China within the past 14 days.
The issue with the coronavirus means United did not take any risks, and Ighalo stayed in Manchester to train alone.