Apologies. No offence intended there so sorry about that.
But no, it wasn't intentional at all. He was trying to adjust when Mitrovic was holding his arm - in football, you do that to reposition the side body beyond his, so you have better control of the grappling committed by your opponent. This happens nearly everytime a free kick is about to take place. It's totally a natural manoeuvre - unfortunately he's caught Mitrovic by doing it. Totally unintentional. Most people in football should be able to see this.
That's exactly why Mitrovic tried telling the ref it wasn't intentional himself.