According to the press service of the Mankunians, the contract with the player was signed for one year with the possibility of extension for another season.
The 33-year-old striker moved to Manchester United as a free agent following the expiration of his contract with the French PSG, for which he has played since 2013.
Together with the Parisians, he became the champion of France six times.
During this time, he played 301 matches for PSG, scored 200 goals and gave 43 assists.
Earlier, Manchester United announced the transfer of Porto defender Alex Telles.