The 22-year-old started and played 87 minutes of Serbia’s 3-2 defeat to Austria in a World Cup qualifier.
United were in the market for a winger over the summer, and tracked Inter Milan’s Ivan Perisic, although a deal never materialised.
Mourinho was also exploring the option of signing Real Madrid star Gareth Bale, but the Welshman ended up staying at the Bernabeu.
The Daily Mirror report there were various conspiracies bandied about as to who Mourinho was at the game to see.
Major Mourinho fan trying to get selfie is kicked out of hotel
Austrian TV, the report cites, believed the Portuguese coach was there to keep an eye on Dusan Tadic, although sources close to United supposedly dismissed the idea.
However, the Mirror claim Mourinho was scouting Gacinovic, who is currently playing for Bundesliga outfit Eintracht Frankfurt.
The report suggests Arsenal had scouts to keep an eye on Gacinovic in his country’s previous two international games.
GETTY
Jose Mourinho was recommended Mijat Gacinovic by Nemanja Matic
It is reckoned Mourinho was given the lowdown on Gacinovic by Nemanja Matic, who has been impressed with the player’s work rate and ability to operate in a variety of positions.
United meanwhile, have been given a boost by the news that Zlatan Ibrahimovic could return to action in time for the Premier League clash against Arsenal on Saturday December 2.
Mourinho’s men resume league duties away to Liverpool on Saturday (12:30pm).
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