Former Derry forward Aaron Devlin is currently on life support in hospital.
He is suffering from what is described as a brain virus.
Messages of support and prayers have been pouring in on social media for the popular player.
Could we ask the entire UUJ family to pray for Aaron Devlin. Aaron took a brain virus on Friday. He's on life... Posted by Jordanstown GAA on Sunday, July 26, 2015
Ballinderry GAC Would like to Thank everyone for their kind messages of support at this difficult time, much appreciated. #Praying4Aaron
— BallinderryShamrocks (@BallinderryGAC) July 26, 2015
Our thoughts and prayers go out to @BallinderryGAC player Aaron Devlin and his family and friends in his battle with illness #speedyrecovery
— Kevin Lynch HC (@KevinLynchHC) July 26, 2015
Our prayers go to @BallinderryGAC player Aaron Devlin at this difficult time. Aaron played with @uujGAA with a few Greencastle lads.
— Greencastle GAA (@greencastleGAA) July 26, 2015
Met young Derry footballer @Aaron_Devlin of @BallinderryGAC a few months ago & he was full of the joys of life. Hope he recovers from this
— Conor Cusack (@Conor14Cusack) July 26, 2015
Keep fighting @Aaron_Devlin everyone is praying for u x
— Caitlin Kelly (@CaitlinKelly9) July 26, 2015