“Barnsley Football Club are devastated to learn of the tragic passing of Chris Barker at just 39 years of age,” it said.
“The thoughts of everyone at Oakwell are with the family, friends and loved ones of Chris Barker at this sad time. “Once A Red, Always A Red.”
Brighton and Hove Albion star Adam Webster played alongside Barker at Aldershot, and he sent his thoughts to Barker’s family.
“RIP Chris Barker,” Webster tweeted. “A former team mate of mine and someone who helped me grow up on and off the pitch @OfficialShots. Thoughts and prayers go out to his family. RIP barks.”