Belgian midfielder Moussa signed a short-term contract with the Sky Blues in September 2012.
The 23-year-old became a free agent following the expiration of his contract with Leicester City.
Brought up through Anderlecht's youth system, Moussa started his English footballing career with Southend where he made 90 appearances and scored seven goals before securing a move to the Foxes in August 2010.
Moussa has also had loan spells at Wycombe, Doncaster and Chesterfield.