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 103 appearances and scored eight goals before securing a move to the Foxes in August 2010.
Moussa has also had loan spells at Wycombe, Doncaster and Chesterfield.
In his first season at the club, Moussa established himself as a fans favorite at City having made 46 appearances in the 2012/13 season, scoring six goals.