The world of football is mourning after a top-flight manager has tragically died aged 44 after suffering a heart attack during a match in Serbia. Mladen Zizovic, manager of Radnicki 1923, collapsed on the side of the pitch after suffering a heart attack 22 minutes into his team's game against Mladost on Sunday evening.

Zizovic was immediately rushed to hospital after receiving medical treatment. However, he died shortly after the match had restarted.

The game was initially suspended after Zizovic collapsed, but after he was transported to hospital, it restarted. But 20 minutes later, it was tragically confirmed that he had passed away.

Players and staff from both clubs broke down in tears on the pitch before the match was abandoned. Footage of the harrowing incident was shared to social media on Monday

A former Bosnia international, Zizovic had only been appointed on October 23, and the game against Mladost was just his third match in charge of the club. He had previously taken charge of the Bosnian side FK Borac Banja Luka in the Europa Conference League last season.

In a tribute to Zizovic, who leaves behind three children, the Serbian FA wrote: "The Football Association of Serbia has received with deep sorrow and disbelief the news of the sudden death of FK Radniki 1923 coach Mladen Zizovic, who passed away during the Mozzart Bet Super League of Serbia match between Mladost and Radnicki 1923 in Lucani.

"His untimely departure represents a tremendous loss for the entire football community.

"The Football Association of Serbia expresses its deepest condolences to the Zizovic family, the members of FK Radnicki 1923, as well as all friends and admirers of his character and work.

"Rest in peace, Mladen. Your love for football and the legacy you left behind will remain with us forever.'

Serbian giants Partizan Belgrade also issued a tribute. It read: "With sadness, we received the news that Radnicki's coach from Kragujevac, Mladen Zizovic, has suddenly passed away.

"Our sincere condolences to the family, friends, and club."

And Red Star Belgrade said: "FK Crvena Zvezda expresses its deepest condolences to the family and friends of Mladen iovi, as well as to the members of FK Radniki 1923. Rest in peace, Mladen."