Former Phillies pitcher Curt Schilling tweeted, "Please send out thoughts and prayers to my former teammate and dear friend @DarrenDaulton10."
The tweet was retweeted by former Phillies center fielder Lenny Dykstra.
All three were members of the 1993 National League Championship team.
The Phillies and Brett Datto, the President of the Darren Daulton Foundation, released a joint statement Wednesday on the three-time All-Star's condition.
"Darren is struggling right now in his four-year battle with brain cancer, thus the reason his friends have posted messages on social media requesting prayers for Darren," the statement read.
Daulton was diagnosed with a glioblastoma, a form of brain cancer, in 2013.
In 2015, Daulton shared some good news with Action News when he was given a clean bill of health.
"When the doctor walks in and opens the door and starts smiling then everything is cool," said Daulton.
Daulton was inducted into the Phillies Wall of Fame in 2010.
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