Hasi believes Mitrovic is sure to become a success with Newcastle United.
Hasi said: “He’s a hard worker, someone who gives everything in every single duel. And his level is constantly increasing. His main quality is to score. Give him a ball in the box and it's in.
"He knows that England is not Belgium. People are stronger and the ball goes faster. But he showed in Champions League that he can be good in tough matches and that he can stay calm and focused. Newcastle is a big step forward. I hope he'll play everything. He can score goals and become a top striker but he first has to settle as a good scorer.”
These are comments which should certainly please Newcastle fans, with Hasi believing Mitrovic to possess all the potential to become the top level striker Newcastle have missed for many years.
A real poaching goalscorer, Mitrovic is expected to complete his move to St James’ Park in the coming days, coming off the back of his most profile season to date.
The 20-year-old, who started his career at Partizan Belgrade, netted 27 goals in 50 games in the 2014/15 campaign, becoming a regular starter for the senior Serbia international team.
He impressed in the Champions League, showing he could step up to the top level, as well as scoring consistently at club level with Anderlecht, and the youngster looks to have real potential to be a success.
Newcastle have moved to sign the forward, and Hasi - who has seen Mitrovic rise from talented youngster to top class striker - believes he is well set to reach his potential whilst turning out on Tyneside.