The 22-year-old winger has netted twice in his first three worldwide appearances for Serbia and played 87 minutes in his side's 3-2 defeat in World Cup qualifying last week.
Instead of the talented, aforementioned duo Mourinho, was scouting 22-year-old Gacinovic, according to the Mirror, but he may face competition from Bayern if he decides to try and lure the young Serb away from Eintracht Frankfurt.
The report suggests Arsenal had scouts to keep an eye on Gacinovic in his country's previous two worldwide games.
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Nemanja Matic played and scored for the Balkan nation in their World Cup qualifier, while Marko Arnautovic scored against the country of his descent as Austria won 3-2.
He played 87 minutes of Friday night's game, and it's said that his worldwide colleague Matic has been key in getting his club manager to watch Gacinovic and has made him aware of his talents.
But it is United who are said to be leading the race for the youngster after Mourinho missed out on the signing of Inter Milan's Ivan Perisic in the summer.
But the Croatian chose to stay in Serie A, and despite the Red Devils rumoured to have turned their attentions to Arsenal target Thomas Lemar, this also came to nought.
High Court Dismisses One Trump Travel Ban Case, May Drop Second
For now, the court did not act on a separate challenge brought by the state of Hawaii, which the court had also agreed to hear. The US Supreme Court has quashed an appeal that had blocked a now-expired version of Donald Trump's anti-immigration decree.
Jose Mourinho didn't take the global break off.
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.
Manchester United manager Jose Mourinho has taken the opportunity to attend the ninth matchday match of World Cup 2018 European Group D finals between Austria and Serbia at the Ernst-Happel Stadium in Vienna on Friday (6/10/2017).
Ubial out as health chief, Palace regrets CA decision
Ubial said that while it pained her to remove the compensation and allowances of PhilHealth employees, she had to follow the law. Harry Roque ( Kabayan party-list), lawyer Restituto Mendoza and from Potenciano Malvar, medical director of the Gen.