8th January 2019
The 22-year-old joined the Glovers on an 18-month contract in January last year, arriving from West Bromwich Albion.
A Republic of Ireland Under-21 international, Donnellan made 24 appearances for Town scoring once and will now become a free agent after being freed from the final six months of his deal.
All at Huish Park wish Shaun all the best for the next step in his career.