He will join the City squad on their tour of Switzerland on Monday.
Coventry chairman Ray Ranson added: "As people will know, Freddy has been a long-term target for us and we are delighted to concluded everything.
"He fits the bill in terms of being a quality player at the right age and will be the fourth signing we have made.
"We told our supporters that we would be strengthening the squad, and hopefully this is further evidence that we are doing just that.
"He fits the bill in terms of age and ability, and we believe he will be a very exciting addition to the squad."