Manchester United will assess Alex Telles upon his return to England after reports in Brazil suggested the new signing has tested positive for coronavirus for a second time.
The 27-year-old was sidelined in October after contracting the virus shortly after his arrival from Porto, and missed four games as a result.
Telles' only appearance for the club came in the 2-1 win over Paris Saint-Germain last month in the Champions League.
And United have sought to clarify Telles' health status after reports in Brazil suggested the full back had tested positive for the disease while away on international duty.