Updated / Tuesday, 19 Jan 2021 06:54 Karl Sheppard: "It's not fair to clubs for me to be playing when I can't be right." Karl Sheppard has said he felt like he "let Shelbourne down" last season as the debilitating effects of psoriatic arthritis left him fatigued and in constant pain. The striker announced his retirement from the game on Sunday aged just 29 due to a condition he has been living with for three years. The Dubliner won league titles with Shamrock Rovers in 2011 and Cork City in 2017 along with two FAI Cups on Leeside in 2016 and 2017. He moved to Shels from Cork City in November 2019 but by then he was feeling the impact of his arthritis.