According to a statement released by the Phillies organization, Manuel's wife, Missy, said he "had made improvements over the past 12 hours, and that his doctors are encouraged."
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This comes following an outpouring of support on social media for the former Phillies manager.
Officials with the Philadelphia Phillies said in a statement on Saturday that the stroke occurred while Manuel was undergoing a medical procedure in a Florida hospital.
"The hospital was able to attend to Charlie immediately and subsequently remove a blood clot," the team said. "The next 24 hours will be crucial to his recovery, and Charlie's family asks that you keep him in your thoughts and prayers at this time."
The 79-year-old managed the Phillies for nine seasons from 2005-13 and guided them to a World Series championship in 2008.
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Former Phillies star, manager Larry Bowa sits down with Action News after best friend's stroke
Under Manuel, the Phillies won five consecutive NL East titles from 2007-11. They beat the Tampa Bay Rays in the 2008 World Series for the city's first major professional sports championship since 1983.
He won more games (780) than any manager in team history and has 1,000 career wins, including three seasons with the Cleveland Indians.
As Manuel is a beloved icon in Philadelphia, fans across the city were wishing him well and hoping for the best.
"When you think of Phillies, you think of Charlie Manuel for sure. He is the Phillies," said Brian Yarnell.
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"It was a shock to me to hear he was in the hospital and had a stroke. He's a Philly favorite," said Anthony Wisniewski from South Philadelphia. "I wish him well healthwise."
The Manuel family said they are very appreciative of every post on social media.
Manuel's wife says she believes the incredible support is aiding in his recovery.
He remains in the Florida area hospital as of Sunday night.
The Associated Press & ESPN contributed to this report.