The former Leeds striker, who turns 35 at the start of November, made his situation public last week and added that it had prompted his immediate retirement from football.
Horsfield signed for Leeds on August 3, 2006, on loan until that Christmas with a view to a permanent move.
He made his debut on the opening Championship game of the season against Norwich at Elland Road on August 5, 2006, and scored his first goal in a 2-2 draw away at Queens Park Rangers three days later.
When Dennis Wise took over as Leeds boss, Horsfield was in and out of the Leeds side and his loan was terminated in January 2007.
We at LeedsUnitedMAD wish the 'Horse' all the best.