Edinson Cavani trained with his Manchester United team-mates for the first time on Sunday ahead of a potential reunion with Paris Saint-Germain in the Champions League on Tuesday.
The Uruguay international joined the Red Devils on transfer deadline day as a free agent, having previously left the Ligue 1 outfit at the end of last season.
The 33-year-old forward was forced to undergo mandatory quarantine at the behest of the United Kingdom's government, however, in line with their regulations amid the coronavirus pandemic.
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Those regulations dictated that he was unable to link up with Ole Gunnar Solskjaer's side in time for their Premier League win against Newcastle on Saturday.