Argentinian media reported Jorge Messi had passed away on Friday in a hospital in Rosario.
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"His constant companionship and behind-the-scenes leadership were essential in backing every step of Lionel," Newell's Old Boys said in a social media post.
Jorge Messi was his son's first coach in Argentina and his sole companion when he first moved to Barcelona as a child, before later becoming his agent.
"My father helped me enormously. He is very critical of me. That made me always want to push myself further," Lionel Messi told DirecTV Sports in 2022.
Messi's family asked the media for "humanity" during the recent World Cup amid persistent rumours over Jorge's health.