Michael Hector has committed his future to Reading after signing a new three-year contract with the Championship club.
Watford have confirmed the signing of Austria defender Sebastian Prodl from Werder Bremen.
Suarez was signed from Celta Vigo in May 2011, but only made two appearances for City during his time at the club.
The 19-year-old made was a regular for City's elite development squad and made his first-team debut when he came off the bench in a League Cup victory over Wolves in October 2011.
His only other appearance for City was in the 4-2 defeat to Aston Villa in the same competition last season.