Jose Mourinho didn't exactly use the international break as a means to wind down, as he was in attendance for Serbia's 3-2 defeat to Austria at the Ernst Happel Stadion.
Mourinho's midfielder Nemanja Matic, who he signed for the second time as a manager, when he bought the former Benfica man from Chelsea for £35 million, was in action, but reports say that the Portuguese, who was spotted in the stands wearing a baseball cap, was on a bit of a scouting mission for the game.
While there was a suggestion that Mourinho was keeping tabs on Southampton winger Dusan Tadic, a player United have been linked with on a regular basis,The Mirror reports that the United boss was watching on Eintracht Frankfurt attacking midfielder Mijat Gacinovic.
The 22-year old, who played for the Bosnia Under 17 side before switching international allegiance, has been a key member of the Eintracht side that currently lies in eighth place in the Bundesliga, while he scored in both of Serbia's World Cup qualifiers last month after being called up to the squad.
He played 87 minutes of Friday night's game, and it's said that his international colleague Matic has been key in getting his club manager to watch Gacinovic and has made him aware of his talents.
The exciting talent has attracted interest from Bayern Munich and Arsenal, who have both had representatives monitoring his performances in recent times.
The Serb only recently put pen to paper on a new contract at Frankfurt, and so his club would not be keen on selling him in January unless a considerable offer came in.
Gacinovic is a highly versatile player, capable of playing on the left or right, but also has the ability to fulfil a central midfield role.
The Vojvodina youth product was an unused substitute as Serbia booked their place in the 2018 World Cup in Russia courtesy of a 1-0 win over Georgia in Belgrade, a result that ensured they topped Group D.
Featured Image Credit: PA