Coventry City signed midfielder Fleck from Scottish Premier League outfit Rangers in summer 2012.
The Sky Blues landed the Scottish Under-21 international on a three-year deal. During the 2012/13 season, he made 24 appearances in all competitions, scoring three goals.
Fleck began his career with Rangers and played more than 40 times for the club, his first appearance coming as a 15-year-old.
He also enjoyed a loan spell with Blackpool during the 2011/12 season.