The Canada defender spent nearly three years in east London after he joined the Hammers in 2014 after he was granted a work permit with a fee set by a tribunal which in theory could rise to £1.5m.
Last year Henry joined Danish Superliga club AC Horsens on a season-long loan. He also spent two spells on loan at Championship side Blackburn Rovers. His West Ham debut and sole first-team appearance came in a UEFA Europa League tie with Astra Giurgiu in August 2015. The Brampton-born player suffered a leg injury during West Ham’s US Tour in July 2o16.