The 24-year-old, who returned to his native England in October, will depart Whitby Town after featuring for the Seasiders over the last two months on a short-term deal.
Simpson began his career at Hartlepool United before moving to the Championship with Preston North End in 2018.
His first spell at Town came in 2022 when he made the switch from Marske United before the striker moved to Australia to play for Sorrento.
He also turned out for Lancaster City, Hyde United, Carlisle United, Accrington Stanley, Cork City, Scarborough Athletic and Connah's Quay Nomads.
Everyone at Whitby Town wishes Connor all the best for the future, and the club thank him for his contribution over the past two months.